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data_description.md

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Data description

tidydata.txt file is the tidy data summarised from the data in https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip It consists of the average values of 579 variables grouped by activities and subjects. With 6 activities and 30 subjects, there are
180 records in the tidydata.txt

Variables in the tidydata.txt are (in the order)

  1. Activity_Id: activity id which is described in the activity_labels.txt file
  2. Activity_label: the names of activities, i.e., walking, walking upstair, walking downstair, sitting, standing and laying
  3. Subject_Id: the identifier number of 30 volunteers
  4. TotalAcc_mean_X: the mean of total acceleration in the X direction
  5. TotalAcc_std_X: the standard deviation of total acceleration in the X direction
  6. TotalAcc_mean_Y: the mean of total acceleration in the Y direction
  7. TotalAcc_std_Y: the standard deviation of total acceleration in the Y direction
  8. TotalAcc_mean_Z: the mean of total acceleration in the Z direction
  9. TotalAcc_std_Z: the standard deviation of total acceleration in the Z direction
  10. BodyAcc_mean_X: the mean of body acceleration in the X direction
  11. BodyAcc_std_X: the standard deviation of body acceleration in the X direction
  12. BodyAcc_mean_Y: the mean of body acceleration in the Y direction
  13. BodyAcc_std_Y: the standard deviation of body acceleration in the Y direction
  14. BodyAcc_mean_Z: the mean of body acceleration in the Z direction
  15. BodyAcc_std_Z: the standard deviation of body acceleration in the Z direction
  16. BodyGyro_mean_X: the mean of body angular velocity in the X direction
  17. BodyAcc_std_X: the standard deviation of body angular velocity in the X direction
  18. BodyAcc_mean_Y: the mean of body angular velocity in the Y direction
  19. BodyAcc_std_Y: the standard deviation of body angular velocity in the Y direction
  20. BodyAcc_mean_Z: the mean of body angular velocity in the Z direction
  21. BodyAcc_std_Z: the standard deviation of body angular velocity in the Z direction
    22-582: variable names and their descriptions are in the features.txt and features_infor.txt


Note that some variable names are coincident??? (check in the features.txt file)


end!