There are 180 observations in the tidy data and each record contains 81 variables. These variables are:
- subjects: subjects are the identifier of the 30 volunteers, ranges 1 to 30.
- activity: this means when the data in the record, which activity is the volunteer doing. the value can be one of
- WALKING
- WALKING_UPSTAIRS
- WALKING_DOWNSTAIRS
- SITTING
- STANDING
- LAYING
- others: the mean and standard deviation of observations of various kinds. All be scaled in range (-1,1)