This code book summarizes the resulting data fields in tidy.txt.
subject- The ID of the test subjectactivity- The type of activity performed when the corresponding measurements were taken
- prefix 't' or 'f' is based on time or frequency measurements.
- Body = body movement.
- Gravity = acceleration of gravity
- Acc = accelerometer measurement
- Gyro = gyroscopic measurements
- Jerk = sudden movement acceleration
- Mag = magnitude of movement
- mean and SD are calculated for each subject for each activity for each mean and SD measurements. The units given are g’s for the accelerometer and rad/sec for the gyro and g/sec and rad/sec/sec for the corresponding jerks.
tBodyAccMeanXtBodyAccMeanYtBodyAccMeanZtBodyAccStdXtBodyAccStdYtBodyAccStdZtGravityAccMeanXtGravityAccMeanYtGravityAccMeanZtGravityAccStdXtGravityAccStdYtGravityAccStdZtBodyAccJerkMeanXtBodyAccJerkMeanYtBodyAccJerkMeanZtBodyAccJerkStdXtBodyAccJerkStdYtBodyAccJerkStdZtBodyGyroMeanXtBodyGyroMeanYtBodyGyroMeanZtBodyGyroStdXtBodyGyroStdYtBodyGyroStdZtBodyGyroJerkMeanXtBodyGyroJerkMeanYtBodyGyroJerkMeanZtBodyGyroJerkStdXtBodyGyroJerkStdYtBodyGyroJerkStdZtBodyAccMagMeantBodyAccMagStdtGravityAccMagMeantGravityAccMagStdtBodyAccJerkMagMeantBodyAccJerkMagStdtBodyGyroMagMeantBodyGyroMagStdtBodyGyroJerkMagMeantBodyGyroJerkMagStdfBodyAccMeanXfBodyAccMeanYfBodyAccMeanZfBodyAccStdXfBodyAccStdYfBodyAccStdZfBodyAccMeanFreqXfBodyAccMeanFreqYfBodyAccMeanFreqZfBodyAccJerkMeanXfBodyAccJerkMeanYfBodyAccJerkMeanZfBodyAccJerkStdXfBodyAccJerkStdYfBodyAccJerkStdZfBodyAccJerkMeanFreqXfBodyAccJerkMeanFreqYfBodyAccJerkMeanFreqZfBodyGyroMeanXfBodyGyroMeanYfBodyGyroMeanZfBodyGyroStdXfBodyGyroStdYfBodyGyroStdZfBodyGyroMeanFreqXfBodyGyroMeanFreqYfBodyGyroMeanFreqZfBodyAccMagMeanfBodyAccMagStdfBodyAccMagMeanFreqfBodyBodyAccJerkMagMeanfBodyBodyAccJerkMagStdfBodyBodyAccJerkMagMeanFreqfBodyBodyGyroMagMeanfBodyBodyGyroMagStdfBodyBodyGyroMagMeanFreqfBodyBodyGyroJerkMagMeanfBodyBodyGyroJerkMagStdfBodyBodyGyroJerkMagMeanFreq
WALKING(value1): subject was walking during the testWALKING_UPSTAIRS(value2): subject was walking up a staircase during the testWALKING_DOWNSTAIRS(value3): subject was walking down a staircase during the testSITTING(value4): subject was sitting during the testSTANDING(value5): subject was standing during the testLAYING(value6): subject was laying down during the test