CookBook
Input Data
The script assumes the UCI dataset is extracted into the current working directory
Output Data
The resulting ./UCI HAR Dataset/tidy_data.txt dataset includes mean and standard deviation variables for all the original variables including either mean or std in their original names.
Transformations
The script, run_analysis.R, does the following,
Load the various files which make-up the UCI dataset
Merges the three test and three train files into a single data table, setting textual columns heading where possible
Creates a smaller second dataset, containing only mean and std variables
Computes the means of this secondary dataset, group by subject/activity.
Saves this last dataset to ./UCI HAR Dataset/tidy_data.txt