The file data_mean_summary.txt is the tidy data with the average of each variable for each activity and each subject.
There are 4 fields:
| Field name | Data Type | Description |
|---|---|---|
| activity | string | one of the 6 activities ('walking', 'walking_up', 'walking_down', 'sitting','standing', 'laying') |
| subject | integer | a number (1 to 30) that identifies the subject who performed the activity |
| variable | string | describing which variable; 18 different variables in total, mean and std of 3 types of measurements in 3 different directions (X, Y, and Z) |
| mean_variable | float | the average of each variable for each activity and each subject |
Total number of rows: 3240 (6 activities * 30 subjects * 18 variables)
To read the data in R: data = read.table('data_mean_summary.txt', header = TRUE)