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<li><a id="rmd-download-source" href="#">Download Rmd</a></li>
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</div>
<h1 class="title toc-ignore"><p><img src="www/img/interactive_logo.png" align="left" style="padding-right: 20px" width="120" /> Making Interactive Case Studies Tutorial</p></h1>
</div>
<!-- Open all links in new tab-->
<p><base target="_blank"/></p>
<p>
</p>
<div id="section-setting-up" class="section level1">
<h1><strong>1. Setting Up</strong></h1>
<hr />
<div id="section-www-directory" class="section level2">
<h2><strong><code>www</code> Directory</strong></h2>
<hr />
<p>Only the files in this <code>www</code> directory will be published with the <code>index.Rmd</code>.</p>
<p>In this <code>www</code> directory, we need to have:</p>
<ul>
<li><code>style.css</code></li>
<li><code>GA_Script.Rhtml</code></li>
<li>move the <code>data</code>, <code>docs</code>, <code>img</code>, etc. directories of the static version into the <code>www</code> directory. These directories contain the files needed to render the <code>index.Rmd</code> file.</li>
<li>Additionally, we need to make an <strong><code>exercise</code> sub-directory</strong>. This is where we would put the <code>.rda</code> files for the “setup” of the exercises.</li>
</ul>
</div>
<div id="section-yaml-header" class="section level2">
<h2><strong>YAML Header</strong></h2>
<hr />
<p>Refer to the YAML header of this <code>.Rmd</code> file.</p>
<p>Important notes (the followings are different from the static version):</p>
<ul>
<li>title</li>
<li><code>css: www/style.css</code> (the statics version does not have the <code>www</code> directory)</li>
<li><code>in_header: www/GA_Script.Rhtml</code> (the statics version does not have the <code>www</code> directory)</li>
<li>the addition of <code>runtime: shiny_prerendered</code></li>
</ul>
</div>
<div id="section-r-setup-chunk" class="section level2">
<h2><strong>R Setup Chunk</strong></h2>
<hr />
<p>Refer to the setup chunk of this <code>.Rmd</code> file.</p>
<p>The main difference here is the addition of the the following libraries:</p>
<div class="sourceCode" id="section-cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="section-cb1-1"><a href="#section-cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(learnr)</span>
<span id="section-cb1-2"><a href="#section-cb1-2" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(gradethis)</span>
<span id="section-cb1-3"><a href="#section-cb1-3" aria-hidden="true" tabindex="-1"></a>gradethis<span class="sc">::</span><span class="fu">gradethis_setup</span>()</span></code></pre></div>
<p><em>Note: you might need to install <code>gradethis</code> from <a href="https://github.com/rstudio/gradethis">github</a></em></p>
</div>
<div id="section-translate" class="section level2">
<h2><strong>Translate</strong></h2>
<hr />
<p>Use the following code for translation</p>
<pre><code><div align="left" id="google_translate_element",></div>
<script type="text/javascript" src='//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit'></script>
<script type="text/javascript">
function googleTranslateElementInit() {
new google.translate.TranslateElement({pageLanguage: 'en'}, 'google_translate_element');
}
</script></code></pre>
<p><em>Note: this is different from the statics version. There is an extra “comma” at the end of <code>id="google_translate_element"</code>. The translation tool would not work without this comma (not sure why).</em></p>
</div>
<div id="section-table-of-content" class="section level2">
<h2><strong>Table of Content</strong></h2>
<hr />
<p>You might want to get rid of the following css code from the static version</p>
<pre><code><style>
#TOC {
background: url("https://opencasestudies.github.io/img/icon-bahi.png");
background-size: contain;
padding-top: 240px !important;
background-repeat: no-repeat;
}
</style></code></pre>
<p>Unlike in the static version, this would not add the logo to the table of content in the interactive app. Could work on how to add logo to the toc for interactive apps.</p>
</div>
<div id="section-optional-add-exercise_block-to-wwwstyle.css" class="section level2">
<h2><strong>Optional: Add <code>exercise_block</code> to <code>www/style.css</code></strong></h2>
<hr />
<p>You could add a specific style for the exercises by adding the following code to the <code>style.css</code> file:</p>
<pre><code>.exercise_block {
padding: .5em;
border: 1px solid lightgrey;
background: white;
color: black;
}</code></pre>
<div id="section-section" class="section level4 exercise_block">
<h4 class="exercise_block"></h4>
<p>This is what the exercise block looks like. You might modify it if you want.</p>
</div>
<div id="section-section-1" class="section level4">
<h4></h4>
</div>
</div>
</div>
<div id="section-modifications-of-the-static-version" class="section level1">
<h1><strong>2. Modifications of the Static Version</strong></h1>
<hr />
<div id="section-data-docs-img-etc.-directories-are-now-sub-directories-of-www" class="section level2">
<h2><strong><code>data</code>, <code>docs</code>, <code>img</code>, etc. Directories are now Sub-Directories of <code>www</code></strong></h2>
<hr />
<p>The file paths in the case study index.Rmd file that refer to these directories will need to be edited to reflect the new parent directory <code>www</code>. There are two cases of code chunks that will need to be edited slightly differently. I will use some examples to explain this. <strong>A quick way to find where needs to be modified is to do <code>CTRL + F</code> and search for <code>here(</code></strong></p>
<div id="section-case-1-static-version-chunk-set-to-echo-false" class="section level3">
<h3>Case 1: Static version chunk set to <code>echo = FALSE</code></h3>
<hr />
<p><em>When the static version has <code>echo = FALSE</code>:</em></p>
<p><img src="www/img/includegraphics.PNG" /></p>
<hr />
<p><em>Simply add the <code>www</code> directory to the interactive version:</em></p>
<p><img src="www/img/includegraphics_new.PNG" /></p>
<hr />
</div>
<div id="section-case-2-static-version-chunk-not-set-to-echo-false" class="section level3">
<h3>Case 2: Static version chunk not set to <code>echo = FALSE</code></h3>
<hr />
<p><em>When the static version does not have <code>echo = FALSE</code>:</em></p>
<p><img src="www/img/load.PNG" /></p>
<hr />
<p><em>Set the original chunk to <code>eval = FALSE</code> and the new chunk to <code>echo = FALSE</code> in the interactive version:</em></p>
<p><img src="www/img/load_new.PNG" /></p>
<hr />
</div>
</div>
</div>
<div id="section-add-exercises" class="section level1">
<h1><strong>3. Add Exercises</strong></h1>
<hr />
<p>Each exercise chunk should have their own name. For example, <code>dw_code1</code> for the first coding problem embedded in the analysis of the “Data Wrangling” section, <code>dw_quiz</code> for the quiz of the “Data Wrangling” section, <code>dv_exercise1</code> for the first coding exercise of the “Exercise” subsection of the “Data Visualization” section, etc.</p>
<div id="section-coding-problems-embedded-in-the-analyses" class="section level2">
<h2><strong>Coding Problems Embedded in the Analyses</strong></h2>
<hr />
<p>These could be the “Question Opportunities” ,or when an analysis is repeated with a different dataset and we want the students to come up with the code using what they learned, etc.</p>
<ul>
<li>First, before the exercise setup chunk, we need to save the dataset needed in the exercise as a <code>.rda</code> file and put it in the <code>exercise</code> sub-directory of the <code>www</code> folder.</li>
<li>Then, in the exercise setup chunk, we need to load whatever libraries needed for this exercise that are not loaded in the <code>index.Rmd</code> setup chunk. In addition, we need to load the <code>.rda</code> made in the first step.</li>
<li>Then, we can start making the exercise.</li>
<li>Finally, when necessary, after the exercise, we can make a click to expend section containing the code and the output so that students may choose to skip these exercises.</li>
</ul>
<p>Here is an example from the obesity case study:</p>
<p><img src="www/img/exercise1.PNG" /></p>
<p><img src="www/img/exercise2.PNG" /></p>
</div>
<div id="section-the-exercise-subsection" class="section level2">
<h2><strong>The Exercise Subsection</strong></h2>
<hr />
<p>Each section (data wrangling, data visualization, etc.) could have their “Exercise” subsection as the last subsection.</p>
<div id="section-quizzes" class="section level3">
<h3><strong>Quizzes</strong></h3>
<hr />
<p>Following is an example from the CO2 case study:</p>
<p><div class="panel-heading tutorial-quiz-title"></div></p>
<div class="panel panel-default">
<div data-label="dw_quiz-1" class="tutorial-question panel-body">
<div id="dw_quiz-1-answer_container" class="shiny-html-output"></div>
<div id="dw_quiz-1-message_container" class="shiny-html-output"></div>
<div id="dw_quiz-1-action_button_container" class="shiny-html-output"></div>
<script>if (Tutorial.triggerMathJax) Tutorial.triggerMathJax()</script>
</div>
</div>
<div class="panel panel-default">
<div data-label="dw_quiz-2" class="tutorial-question panel-body">
<div id="dw_quiz-2-answer_container" class="shiny-html-output"></div>
<div id="dw_quiz-2-message_container" class="shiny-html-output"></div>
<div id="dw_quiz-2-action_button_container" class="shiny-html-output"></div>
<script>if (Tutorial.triggerMathJax) Tutorial.triggerMathJax()</script>
</div>
</div>
<div class="panel panel-default">
<div data-label="dw_quiz-3" class="tutorial-question panel-body">
<div id="dw_quiz-3-answer_container" class="shiny-html-output"></div>
<div id="dw_quiz-3-message_container" class="shiny-html-output"></div>
<div id="dw_quiz-3-action_button_container" class="shiny-html-output"></div>
<script>if (Tutorial.triggerMathJax) Tutorial.triggerMathJax()</script>
</div>
</div>
</div>
<div id="section-coding-exercise" class="section level3">
<h3><strong>Coding Exercise</strong></h3>
<hr />
<ul>
<li>Following is an example from the CO2 case study <strong>without use of the <code>gradethis</code> package</strong>:</li>
</ul>
<div id="section-section-2" class="section level4 exercise_block">
<h4 class="exercise_block"></h4>
<p>We have created a dataset called <code>wide_format</code> that is in “wide” format. Write some code to convert it to “long” format. (We want 3 columns with names “ID”, “Variable”, and “Value”.)</p>
<div class="tutorial-exercise" data-label="dw_exercise1" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="5">
<pre class="text"><code>wide_format</code></pre>
<pre><code> ID Year Length
1 1 2015 20.0
2 2 2018 21.5
3 3 2019 19.0</code></pre>
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</div>
<div class="tutorial-exercise-support" data-label="dw_exercise1-hint" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code>wide_format %>%
pivot_longer()</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise1-solution" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code>wide_format %>%
pivot_longer(cols = -ID, names_to = "Variable", values_to = "Value")</code></pre>
</div>
</div>
<div id="section-section-3" class="section level4">
<h4></h4>
<p>
</p>
<ul>
<li>Following is an example from the CO2 case study <strong>with use of the <code>gradethis</code> package</strong>:</li>
</ul>
</div>
<div id="section-section-4" class="section level4 exercise_block">
<h4 class="exercise_block"></h4>
<p><code>mtcars</code> is a built-in R dataset as shown below. Use this dataset to complete the following exercise.</p>
<div class="sourceCode" id="section-cb9"><pre class="sourceCode r"><code class="sourceCode r"><span id="section-cb9-1"><a href="#section-cb9-1" aria-hidden="true" tabindex="-1"></a>mtcars</span></code></pre></div>
<pre><code> mpg cyl disp hp drat wt qsec vs am gear carb
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2</code></pre>
<p>Write some code that will:</p>
<ol style="list-style-type: decimal">
<li>Create a new dataset called <code>new.mtcars</code> from <code>mtcars</code>.</li>
<li>Create a new column called <code>car</code> in <code>new.mtcars</code> that uses the values from the row names of <code>mtcars</code>. (Use the <code>rownames_to_column</code> function from the <code>tibble</code> package. See documentation <a href="https://tibble.tidyverse.org/reference/rownames.html" target="_blank">here</a>.)</li>
<li>Only keep the <code>car</code>, <code>mpg</code>, and <code>cyl</code> columns of this <code>new.mtcars</code> dataset.</li>
<li>Only keep the cars that have <code>cyl</code> = 4.</li>
<li>Rearrange the dataset by <code>mpg</code> in descending order.</li>
</ol>
<p><em>Note: replace the underscores(“_”) with your code with one character per “_”. Click “Submit Answer” to check your answer. </em></p>
<div class="tutorial-exercise" data-label="dw_exercise2" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># step 1
new.mtcars <- mtcars %>%
# step 2
rownames_to_column(var = "___") %>%
# step 3
______(___, ___, ___) %>%
# step 4
______(___ == _) %>%
# step 5
_______(____(mpg))
# view data (Do NOT include this part when submitting your answer!)
# new.mtcars</code></pre>
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<div class="tutorial-exercise-support" data-label="dw_exercise2-hint-1" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise2-hint-2" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?
# step 3:
# Which function of the "dplyr" package select columns?</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise2-hint-3" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?
# step 3:
# Which function of the "dplyr" package select columns?
# step 4:
# Which function of the "dplyr" package subset rows?</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise2-hint-4" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?
# step 3:
# Which function of the "dplyr" package select columns?
# step 4:
# Which function of the "dplyr" package subset rows?
# step 5:
# Which function of the "dplyr" package will reorder the data?
# What argument do we need to reorder in descending order?</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise2-hint-5" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code># Next hint will show you the solution</code></pre>
</div>
<div class="tutorial-exercise-support" data-label="dw_exercise2-solution" data-completion="1" data-diagnostics="1" data-startover="1" data-lines="0">
<pre class="text"><code>new.mtcars <- mtcars %>%
rownames_to_column(var = "car") %>%
select(car, mpg, cyl) %>%
filter(cyl == 4) %>%
arrange(desc(mpg))</code></pre>
</div>
</div>
<div id="section-section-5" class="section level4">
<h4></h4>
</div>
</div>
</div>
</div>
<div id="section-maintenance-notes" class="section level1">
<h1><strong>4. Maintenance Notes</strong></h1>
<hr />
<p>See the <code>maintenance_notes.Rmd</code> file as an example.</p>
<p>Make sure to list the names of the exercise chunks for future maintenance. Except for things mentioned in this tutorial, other changes should be noted as well.</p>
<p><img src="www/img/maintenance.PNG" /></p>
</div>
<div id="section-publishing" class="section level1">
<h1><strong>5. Publishing</strong></h1>
<hr />
Make sure the <code>rsconnect</code> folder is also pushed to GitHub.
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"library(learnr)", "library(gradethis)", "gradethis::gradethis_setup()"
), chunk_opts = list(label = "setup", include = FALSE)), setup = "ID <- c(1, 2, 3)\nYear <- c(2015, 2018, 2019)\nLength <- c(20, 21.5, 19)\nwide_format <- data.frame(ID, Year, Length)",
chunks = list(list(label = "dw_exercise1-setup", code = "ID <- c(1, 2, 3)\nYear <- c(2015, 2018, 2019)\nLength <- c(20, 21.5, 19)\nwide_format <- data.frame(ID, Year, Length)",
opts = list(label = "\"dw_exercise1-setup\""), engine = "r"),
list(label = "dw_exercise1", code = "wide_format", opts = list(
label = "\"dw_exercise1\"", exercise = "TRUE", exercise.eval = "TRUE",
exercise.lines = "5"), engine = "r")), code_check = NULL,
error_check = NULL, check = NULL, solution = structure(c("wide_format %>%",
" pivot_longer(cols = -ID, names_to = \"Variable\", values_to = \"Value\")"
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eval = TRUE, echo = TRUE, results = "markup", tidy = FALSE,
tidy.opts = NULL, collapse = FALSE, prompt = FALSE, comment = NA,
highlight = FALSE, size = "normalsize", background = "#F7F7F7",
strip.white = TRUE, cache = 0, cache.path = "index_cache/html/",
cache.vars = NULL, cache.lazy = TRUE, dependson = NULL,
autodep = FALSE, cache.rebuild = FALSE, fig.keep = "high",
fig.show = "asis", fig.align = "center", fig.path = "index_files/figure-html/",
dev = "png", dev.args = NULL, dpi = 192, fig.ext = "png",
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fig.scap = NULL, fig.lp = "fig:", fig.subcap = NULL,
fig.pos = "", out.width = "90%", out.height = NULL, out.extra = NULL,
fig.retina = 2, external = TRUE, sanitize = FALSE, interval = 1,
aniopts = "controls,loop", warning = FALSE, error = FALSE,
message = FALSE, render = NULL, ref.label = NULL, child = NULL,
engine = "r", split = FALSE, include = TRUE, purl = TRUE,
exercise.timelimit = 60, exercise.checker = "function (label = NULL, solution_code = NULL, user_code = NULL, \n check_code = NULL, envir_result = NULL, evaluate_result = NULL, \n envir_prep = NULL, last_value = NULL, ...) \n{\n (utils::getFromNamespace(\"check_exercise\", \"gradethis\"))(label = label, \n solution_code = solution_code, user_code = user_code, \n check_code = check_code, envir_result = envir_result, \n evaluate_result = evaluate_result, envir_prep = envir_prep, \n last_value = last_value, ...)\n}",
exercise.error.check.code = "gradethis_error_checker()",
label = "dw_exercise1", exercise = TRUE, exercise.eval = TRUE,
exercise.lines = 5, code = "wide_format", out.width.px = "90%",
out.height.px = 480, params.src = "dw_exercise1, exercise=TRUE, exercise.eval=TRUE, exercise.lines = 5",
fig.alt = NULL, fig.num = 0, exercise.df_print = "default"),
engine = "r"), class = "tutorial_exercise"))
</script>
<script type="application/shiny-prerendered" data-context="server">
`tutorial-exercise-dw_exercise2-result` <- learnr:::setup_exercise_handler(reactive(req(input$`tutorial-exercise-dw_exercise2-code-editor`)), session)
output$`tutorial-exercise-dw_exercise2-output` <- renderUI({
`tutorial-exercise-dw_exercise2-result`()
})
</script>
<script type="application/shiny-prerendered" data-context="server">
learnr:::store_exercise_cache(structure(list(global_setup = structure(c("knitr::opts_chunk$set(include = TRUE, comment = NA, echo = TRUE,",
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), chunk_opts = list(label = "setup", include = FALSE)), setup = "library(tidyverse)",
chunks = list(list(label = "dw_exercise2-setup", code = "library(tidyverse)",
opts = list(label = "\"dw_exercise2-setup\""), engine = "r"),
list(label = "dw_exercise2", code = "# step 1\nnew.mtcars <- mtcars %>%\n # step 2\n rownames_to_column(var = \"___\") %>%\n # step 3\n ______(___, ___, ___) %>%\n # step 4\n ______(___ == _) %>%\n # step 5\n _______(____(mpg))\n\n# view data (Do NOT include this part when submitting your answer!)\n# new.mtcars",
opts = list(label = "\"dw_exercise2\"", exercise = "TRUE",
eval = "FALSE"), engine = "r")), code_check = NULL,
error_check = NULL, check = structure("grade_code()", chunk_opts = list(
label = "dw_exercise2-check", eval = FALSE)), solution = structure(c("new.mtcars <- mtcars %>%",
" rownames_to_column(var = \"car\") %>%", " select(car, mpg, cyl) %>%",
" filter(cyl == 4) %>%", " arrange(desc(mpg))"), chunk_opts = list(
label = "dw_exercise2-solution")), options = list(eval = FALSE,
echo = TRUE, results = "markup", tidy = FALSE, tidy.opts = NULL,
collapse = FALSE, prompt = FALSE, comment = NA, highlight = FALSE,
size = "normalsize", background = "#F7F7F7", strip.white = TRUE,
cache = 0, cache.path = "index_cache/html/", cache.vars = NULL,
cache.lazy = TRUE, dependson = NULL, autodep = FALSE,
cache.rebuild = FALSE, fig.keep = "high", fig.show = "asis",
fig.align = "center", fig.path = "index_files/figure-html/",
dev = "png", dev.args = NULL, dpi = 192, fig.ext = "png",
fig.width = 7, fig.height = 5, fig.env = "figure", fig.cap = NULL,
fig.scap = NULL, fig.lp = "fig:", fig.subcap = NULL,
fig.pos = "", out.width = "90%", out.height = NULL, out.extra = NULL,
fig.retina = 2, external = TRUE, sanitize = FALSE, interval = 1,
aniopts = "controls,loop", warning = FALSE, error = FALSE,
message = FALSE, render = NULL, ref.label = NULL, child = NULL,
engine = "r", split = FALSE, include = TRUE, purl = TRUE,
exercise.timelimit = 60, exercise.checker = "function (label = NULL, solution_code = NULL, user_code = NULL, \n check_code = NULL, envir_result = NULL, evaluate_result = NULL, \n envir_prep = NULL, last_value = NULL, ...) \n{\n (utils::getFromNamespace(\"check_exercise\", \"gradethis\"))(label = label, \n solution_code = solution_code, user_code = user_code, \n check_code = check_code, envir_result = envir_result, \n evaluate_result = evaluate_result, envir_prep = envir_prep, \n last_value = last_value, ...)\n}",
exercise.error.check.code = "gradethis_error_checker()",
label = "dw_exercise2", exercise = TRUE, code = c("# step 1",
"new.mtcars <- mtcars %>%", " # step 2", " rownames_to_column(var = \"___\") %>%",
" # step 3", " ______(___, ___, ___) %>%", " # step 4",
" ______(___ == _) %>%", " # step 5", " _______(____(mpg))",
"", "# view data (Do NOT include this part when submitting your answer!)",
"# new.mtcars"), out.width.px = "90%", out.height.px = 480,
params.src = "dw_exercise2, exercise=TRUE, eval=FALSE",
fig.num = 0, exercise.df_print = "default"), engine = "r"), class = "tutorial_exercise"))
</script>
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</div>
<div id="rmd-source-code">---
title: |
  ![](www/img/interactive_logo.png){width=120px align=left style="padding-right: 20px"}
  Making Interactive Case Studies Tutorial
css: www/style.css
output:
  html_document:
    includes:
       in_header: www/GA_Script.Rhtml
    self_contained: yes
    code_download: yes
    highlight: tango
    number_sections: no
    theme: cosmo
    toc: yes
    toc_float: yes
  pdf_document:
    toc: yes
  word_document:
    toc: yes
runtime: shiny_prerendered
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(include = TRUE, comment = NA, echo = TRUE,
                      message = FALSE, warning = FALSE, cache = FALSE,
                      fig.align = "center", out.width = '90%')
library(knitr)
library(here)

# additional libraries needed
library(learnr)
library(gradethis)
gradethis::gradethis_setup()
```

<!-- Open all links in new tab-->  
<base target="_blank"/> 

<p>&nbsp;</p>

# **1. Setting Up**
***

## **`www` Directory**
***

Only the files in this `www` directory will be published with the `index.Rmd`.

In this `www` directory, we need to have:

* `style.css`
* `GA_Script.Rhtml`
*  move the `data`, `docs`, `img`, etc. directories of the static version into the `www` directory. These directories contain the files needed to render the `index.Rmd` file.
* Additionally, we need to make an **`exercise` sub-directory**. This is where we would put the `.rda` files for the "setup" of the exercises.

## **YAML Header**
***

Refer to the YAML header of this `.Rmd` file.

Important notes (the followings are different from the static version):

* title
* `css: www/style.css` (the statics version does not have the `www` directory)
* `in_header: www/GA_Script.Rhtml` (the statics version does not have the `www` directory)
* the addition of `runtime: shiny_prerendered`

## **R Setup Chunk**
***

Refer to the setup chunk of this `.Rmd` file.

The main difference here is the addition of the the following libraries:

```{r, eval=FALSE}
library(learnr)
library(gradethis)
gradethis::gradethis_setup()
```

*Note: you might need to install `gradethis` from [github](https://github.com/rstudio/gradethis)*

## **Translate**
***

Use the following code for translation

```
<div align="left" id="google_translate_element",></div>

<script type="text/javascript" src='//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit'></script>

<script type="text/javascript">
function googleTranslateElementInit() {
  new google.translate.TranslateElement({pageLanguage: 'en'}, 'google_translate_element');
}
</script>
```

*Note: this is different from the statics version. There is an extra "comma" at the end of `id="google_translate_element"`. The translation tool would not work without this comma (not sure why).*

## **Table of Content**
***

You might want to get rid of the following css code from the static version

```
<style>
#TOC {
  background: url("https://opencasestudies.github.io/img/icon-bahi.png");
  background-size: contain;
  padding-top: 240px !important;
  background-repeat: no-repeat;
}
</style>
```

Unlike in the static version, this would not add the logo to the table of content in the interactive app. Could work on how to add logo to the toc for interactive apps.

## **Optional: Add `exercise_block` to `www/style.css`**
***

You could add a specific style for the exercises by adding the following code to the `style.css` file:

```
.exercise_block {
    padding: .5em;
    border: 1px solid lightgrey;
    background: white;
    color: black;
}
```

#### {.exercise_block}

This is what the exercise block looks like. You might modify it if you want.

####


# **2. Modifications of the Static Version**
***

## **`data`, `docs`, `img`, etc. Directories are now Sub-Directories of `www`**
***

The file paths in the case study index.Rmd file that refer to these directories will need to be edited to reflect the new parent directory `www`. There are two cases of code chunks that will need to be edited slightly differently. I will use some examples to explain this. **A quick way to find where needs to be modified is to do `CTRL + F` and search for `here(`**

### Case 1: Static version chunk set to `echo = FALSE`

***
*When the static version has `echo = FALSE`:*

![](www/img/includegraphics.PNG)

***

*Simply add the `www` directory to the interactive version:*

![](www/img/includegraphics_new.PNG)

***

### Case 2: Static version chunk not set to `echo = FALSE`
***

*When the static version does not have `echo = FALSE`:*

![](www/img/load.PNG)

***

*Set the original chunk to `eval = FALSE` and the new chunk to `echo = FALSE` in the interactive version:*

![](www/img/load_new.PNG)

***


# **3. Add Exercises**
***

Each exercise chunk should have their own name. For example, `dw_code1` for the first coding problem embedded in the analysis of the "Data Wrangling" section, `dw_quiz` for the quiz of the "Data Wrangling" section, `dv_exercise1` for the first coding exercise of the "Exercise" subsection of the "Data Visualization" section, etc.

## **Coding Problems Embedded in the Analyses**
***

These could be the "Question Opportunities" ,or when an analysis is repeated with a different dataset and we want the students to come up with the code using what they learned, etc.

* First, before the exercise setup chunk, we need to save the dataset needed in the exercise as a `.rda` file and put it in the `exercise` sub-directory of the `www` folder.
* Then, in the exercise setup chunk, we need to load whatever libraries needed for this exercise that are not loaded in the `index.Rmd` setup chunk. In addition, we need to load the `.rda` made in the first step.
* Then, we can start making the exercise.
* Finally, when necessary, after the exercise, we can make a click to expend section containing the code and the output so that students may choose to skip these exercises.

Here is an example from the obesity case study:

![](www/img/exercise1.PNG)

![](www/img/exercise2.PNG)


## **The Exercise Subsection**
***

Each section (data wrangling, data visualization, etc.) could have their "Exercise" subsection as the last subsection.

### **Quizzes**
***

Following is an example from the CO2 case study:

```{r dw_quiz, echo = FALSE}
quiz(caption = "",
  question("Which one of the following functions in the `dplyr` package allows us to see all of the variables (columns) at once, where several values of those columns are shown on the right of the variable names?",
    answer("`slice_head()`", message = "This function allows us to see just the first rows of the data."),
    answer("`slice_sample()`", message = "This function allows us to see a selection of random rows of the data."),
    answer("`slice_tail()`", message = "This function allows us to see the rows at the end of the data."),
    answer("`glimpse()`", correct = TRUE),
    allow_retry = TRUE,
    random_answer_order = TRUE
  ),
  question("Which one of the pipe operators (from the `magrittr` package) should be used right after a variable name if we want to perform a sequence of operations on that variable, and meanwhile, assign the final output to that variable (without redefining that variable using `<-` or `=`)?",
    answer("`%>%`", message = "This operator cannot assign the final output to that variable."),
    answer("`%<%`", message = "This is not a valie pipe operator."),
    answer("`%T>%`", message = "This is the side-effects operator."),
    answer("`%<>%`", correct = TRUE),
    allow_retry = TRUE,
    random_answer_order = TRUE
  ),
  question("Which of the following can the `mutate()` function in the `dplyr` package do? (more than one correct answers)",
    answer("Select certain variables(columns) of the data.", message = "Selecting certain variables(columns) of the data is the function of the `select()` function."),
    answer("Rename a variable.", message = "Renaming a variable is the function of the `rename()` function."),
    answer("Create a new variable.", correct = TRUE),
    answer("Modify an existing variable.", correct = TRUE),
    allow_retry = TRUE,
    random_answer_order = TRUE
  )
)
```

### **Coding Exercise**
***

* Following is an example from the CO2 case study **without use of the `gradethis` package**:

#### {.exercise_block}

We have created a dataset called `wide_format` that is in "wide" format. Write some code to convert it to "long" format. (We want 3 columns with names "ID", "Variable", and "Value".)

```{r dw_exercise1-setup}
ID <- c(1, 2, 3)
Year <- c(2015, 2018, 2019)
Length <- c(20, 21.5, 19)
wide_format <- data.frame(ID, Year, Length)
```

```{r dw_exercise1, exercise=TRUE, exercise.eval=TRUE, exercise.lines = 5}
wide_format
```

```{r dw_exercise1-hint}
wide_format %>%
  pivot_longer()
```

```{r dw_exercise1-solution}
wide_format %>%
  pivot_longer(cols = -ID, names_to = "Variable", values_to = "Value")
```

####

<p>&nbsp;</p>

* Following is an example from the CO2 case study **with use of the `gradethis` package**:

#### {.exercise_block}

`mtcars` is a built-in R dataset as shown below. Use this dataset to complete the following exercise.

```{r}
mtcars
```

Write some code that will:

1. Create a new dataset called `new.mtcars` from `mtcars`.
2. Create a new column called `car` in `new.mtcars` that uses the values from the row names of `mtcars`. (Use the `rownames_to_column` function from the `tibble` package. See documentation [here](https://tibble.tidyverse.org/reference/rownames.html){target="_blank"}.)
3. Only keep the `car`, `mpg`, and `cyl` columns of this `new.mtcars` dataset.
4. Only keep the cars that have `cyl` = 4.
5. Rearrange the dataset by `mpg` in descending order.

*Note: replace the underscores("\_") with your code with one character per "\_". Click "Submit Answer" to check your answer. *

```{r dw_exercise2-setup}
library(tidyverse)
```

```{r dw_exercise2, exercise=TRUE, eval=FALSE}
# step 1
new.mtcars <- mtcars %>%
  # step 2
  rownames_to_column(var = "___") %>%
  # step 3
  ______(___, ___, ___) %>%
  # step 4
  ______(___ == _) %>%
  # step 5
  _______(____(mpg))

# view data (Do NOT include this part when submitting your answer!)
# new.mtcars
```

```{r dw_exercise2-hint-1}
# step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?
```

```{r dw_exercise2-hint-2}
# step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?

# step 3:
# Which function of the "dplyr" package select columns?
```

```{r dw_exercise2-hint-3}
# step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?

# step 3:
# Which function of the "dplyr" package select columns?

# step 4:
# Which function of the "dplyr" package subset rows?
```

```{r dw_exercise2-hint-4}
# step 2:
# The "var" argument is the name of the new column that will use the values from the row names. What is the column name?

# step 3:
# Which function of the "dplyr" package select columns?

# step 4:
# Which function of the "dplyr" package subset rows?

# step 5:
# Which function of the "dplyr" package will reorder the data?
# What argument do we need to reorder in descending order?
```

```{r dw_exercise2-hint-5}
# Next hint will show you the solution
```

```{r dw_exercise2-solution}
new.mtcars <- mtcars %>%
  rownames_to_column(var = "car") %>%
  select(car, mpg, cyl) %>%
  filter(cyl == 4) %>%
  arrange(desc(mpg))
```

```{r dw_exercise2-check, eval=FALSE}
grade_code()
```

####


# **4. Maintenance Notes**
***

See the `maintenance_notes.Rmd` file as an example.

Make sure to list the names of the exercise chunks for future maintenance. Except for things mentioned in this tutorial, other changes should be noted as well.

![](www/img/maintenance.PNG)

# **5. Publishing**
***

Make sure the `rsconnect` folder is also pushed to GitHub.</div>
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