How to read variables - attempt to summarize:
- 't' or 'f' - time domain signals or frequency domain signals. 'f' signals are derived signals(Fast Fourier Transform was applied)
- BodyAcc/GravityAcc - body/gravity acceleration(derived from acceleration signal by low pass Butterworth filter with a corner frequency of 0.3 Hz)
- Acc/Gyro + Jerk - body linear acceleration and angular velocity Jerk signals(the body linear acceleration and angular velocity were derived in time to obtain these 2 signals)
- Mag - magnitude related(calculated using the Euclidean norm)(tBodyAccMag, tGravityAccMag, tBodyAccJerkMag, tBodyGyroMag, tBodyGyroJerkMag)
- mean_value - mean value
- standard_deviation standard deviation
Full list(brackets at the end of line contain name of original column(see features.txt)):
- SUBJECT_ID - An identifier of the subject who carried out the experiment (int 1-30)
- ACTIVITY_NAME - Subject activity (Factor with 6 levels: WALKING, WALKING_UPSTAIRS, WALKING_DOWNSTAIRS, SITTING, STANDING, LAYING)
- UOMs(Units Of Measure) of variables below correspond to original variables.
- variables below are averaged across SUBJECT_ID, ACTIVITY_NAME groups.
- variables below are timed domain signals
- tBodyAcc_mean_value_X - body acceleration, mean value, X axis (tBodyAcc-mean()-X)
- tBodyAcc_mean_value_Y - body acceleration, mean value, Y axis (tBodyAcc-mean()-Y)
- tBodyAcc_mean_value_Z - body acceleration, mean value, Z axis (tBodyAcc-mean()-Z)
- tBodyAcc_standard_deviation_X - body acceleration, standard deviation, X axis (tBodyAcc-std()-X)
- tBodyAcc_standard_deviation_Y - body acceleration, standard deviation, Y axis (tBodyAcc-std()-Y)
- tBodyAcc_standard_deviation_Z - body acceleration, standard deviation, Z axis (tBodyAcc-std()-Z)
- tGravityAcc_mean_value_X - gravity acceleration, mean value, X axis (tGravityAcc-mean()-X)
- tGravityAcc_mean_value_Y - gravity acceleration, mean value, Y axis (tGravityAcc-mean()-Y)
- tGravityAcc_mean_value_Z - gravity acceleration, mean value, Z axis (tGravityAcc-mean()-Z)
- tGravityAcc_standard_deviation_X - gravity acceleration, mean value, X axis (tGravityAcc-std()-X)
- tGravityAcc_standard_deviation_Y - gravity acceleration, mean value, Y axis (tGravityAcc-std()-Y)
- tGravityAcc_standard_deviation_Z - gravity acceleration, mean value, Y axis (tGravityAcc-std()-Z)
- tBodyAccJerk_mean_value_X - body acceleration, jerk component, mean value, X axis (tBodyAccJerk-mean()-X)
- tBodyAccJerk_mean_value_Y - body acceleration, jerk component, mean value, Y axis (tBodyAccJerk-mean()-Y)
- tBodyAccJerk_mean_value_Z - body acceleration, jerk component, mean value, Z axis (tBodyAccJerk-mean()-Z)
- tBodyAccJerk_standard_deviation_X - body acceleration, jerk component, standard deviation, X axis (tBodyAccJerk-std()-X)
- tBodyAccJerk_standard_deviation_Y - body acceleration, jerk component, standard deviation, Y axis (tBodyAccJerk-std()-Y)
- tBodyAccJerk_standard_deviation_Z - body acceleration, jerk component, standard deviation, Z axis (tBodyAccJerk-std()-Z)
- tBodyGyro_mean_value_X - Gyro signal(?), mean value, X axis (tBodyGyro-mean()-X)
- tBodyGyro_mean_value_Y - Gyro signal(?), mean value, Y axis (tBodyGyro-mean()-Y)
- tBodyGyro_mean_value_Z - Gyro signal(?), mean value, Z axis (tBodyGyro-mean()-Z)
- tBodyGyro_standard_deviation_X - Gyro signal(?), standard deviation, X axis (tBodyGyro-std()-X)
- tBodyGyro_standard_deviation_Y - Gyro signal(?), standard deviation, Y axis (tBodyGyro-std()-Y)
- tBodyGyro_standard_deviation_Z - Gyro signal(?), standard deviation, Z axis (tBodyGyro-std()-Z)
- tBodyGyroJerk_mean_value_X - Gyro signal(?), jerk component, mean value, X axis (tBodyGyroJerk-mean()-X)
- tBodyGyroJerk_mean_value_Y - Gyro signal(?), jerk component, mean value, Y axis (tBodyGyroJerk-mean()-Y)
- tBodyGyroJerk_mean_value_Z - Gyro signal(?), jerk component, mean value, Z axis (tBodyGyroJerk-mean()-Z)
- tBodyGyroJerk_standard_deviation_X - Gyro signal(?), jerk component, standard deviation, X axis (tBodyGyroJerk-std()-X)
- tBodyGyroJerk_standard_deviation_Y - Gyro signal(?), jerk component, standard deviation, Y axis (tBodyGyroJerk-std()-Y)
- tBodyGyroJerk_standard_deviation_Z - Gyro signal(?), jerk component, standard deviation, Z axis (tBodyGyroJerk-std()-Z)
- tBodyAccMag_mean_value - body acceleration magnitude, mean value (tBodyAccMag-mean())
- tBodyAccMag_standard_deviation body acceleration magnitude, standard deviation (tBodyAccMag-std())
- tGravityAccMag_mean_value - gravity acceleration magnitude, mean value (tGravityAccMag-mean())
- tGravityAccMag_standard_deviation - gravity acceleration magnitude, standard deviation (tGravityAccMag-std())
- tBodyAccJerkMag_mean_value - body acceleration, jerk component, magnitude, mean value (tBodyAccJerkMag-mean())
- tBodyAccJerkMag_standard_deviation - body acceleration, jerk component, magnitude, standard deviation (tBodyAccJerkMag-std())
- tBodyGyroMag_mean_value - gyro signal(?), magnitude, mean value (tBodyGyroMag-mean())
- tBodyGyroMag_standard_deviation - gyro signal(?), magnitude, standard deviation (tBodyGyroMag-std())
- tBodyGyroJerkMag_mean_value - gyro signal, jerk component, magnitude, mean value (tBodyGyroJerkMag-mean())
- tBodyGyroJerkMag_standard_deviation - gyro signal, jerk component, magnitude, standard deviation (tBodyGyroJerkMag-std())
- variables below are frequency domain signals
- fBodyAcc_mean_value_X - body acceleration, mean value, X axis (fBodyAcc-mean()-X)
- fBodyAcc_mean_value_Y - body acceleration, mean value, Y axis (fBodyAcc-mean()-Y)
- fBodyAcc_mean_value_Z - body acceleration, mean value, Z axis (fBodyAcc-mean()-Z)
- fBodyAcc_standard_deviation_X - body acceleration, standard deviation, X axis (fBodyAcc-std()-X)
- fBodyAcc_standard_deviation_Y - body acceleration, standard deviation, Y axis (fBodyAcc-std()-Y)
- fBodyAcc_standard_deviation_Z - body acceleration, standard deviation, Z axis (fBodyAcc-std()-Z)
- fBodyAccJerk_mean_value_X - body acceleration, jerk component, mean value, X axis (fBodyAccJerk-mean()-X)
- fBodyAccJerk_mean_value_Y - body acceleration, jerk component, mean value, Y axis (fBodyAccJerk-mean()-Y)
- fBodyAccJerk_mean_value_Z - body acceleration, jerk component, mean value, Z axis (fBodyAccJerk-mean()-Z)
- fBodyAccJerk_standard_deviation_X - body acceleration, jerk component, standard deviation, X axis (fBodyAccJerk-std()-X)
- fBodyAccJerk_standard_deviation_Y - body acceleration, jerk component, standard deviation, Y axis (fBodyAccJerk-std()-Y)
- fBodyAccJerk_standard_deviation_Z - body acceleration, jerk component, standard deviation, Z axis (fBodyAccJerk-std()-Z)
- fBodyGyro_mean_value_X - gyro signal(?), mean value, X axis (fBodyGyro-mean()-X)
- fBodyGyro_mean_value_Y - gyro signal(?), mean value, Y axis (fBodyGyro-mean()-Y)
- fBodyGyro_mean_value_Z - gyro signal(?), mean value, Z axis (fBodyGyro-mean()-Z)
- fBodyGyro_standard_deviation_X - gyro signal(?), standard deviation, X axis (fBodyGyro-std()-X)
- fBodyGyro_standard_deviation_Y - gyro signal(?), standard deviation, Y axis (fBodyGyro-std()-Y)
- fBodyGyro_standard_deviation_Z - gyro signal(?), standard deviation, Z axis (fBodyGyro-std()-Z)
- fBodyAccMag_mean_value - body acceleration, magnitude, mean value (fBodyAccMag-mean())
- fBodyAccMag_standard_deviation - body acceleration, magnitude, standard deviation (fBodyAccMag-mean())
- fBodyBodyAccJerkMag_mean_value - body acceleration, jerk component, magnitude, mean value (fBodyBodyAccJerkMag-mean())
- fBodyBodyAccJerkMag_standard_deviation - body acceleration, jerk component, magnitude, standard deviation(fBodyBodyAccJerkMag-std())
- fBodyBodyGyroMag_mean_value - gyro signal(?), magnitude, mean value (fBodyBodyGyroMag-mean())
- fBodyBodyGyroMag_standard_deviation - gyro signal(?), magnitude, standard deviation (fBodyBodyGyroMag-std())
- fBodyBodyGyroJerkMag_mean_value - gyro signal(?), jerk component, magnitude, mean value (fBodyBodyGyroJerkMag-mean())
- fBodyBodyGyroJerkMag_standard_deviation - gyro signal(?), jerk component, magnitude, standard deviation (fBodyBodyGyroJerkMag-std())