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Code Book

This book will describe the variables used in the tidy data set. For comparison, the original descriptions can be found in the features_info.txt file within the "UCI HAR Dataset". The variables used here are a subset of the original features.

There are a total of 88 variables within this dataset. The first two identify the subject and activity.

SubjectID

This is a numeric value between 1 and 30 which identifies the participant in the experiment.

ActivityID

A list of various activities used in measuring the variables:

  • WALKING
  • WALKING_DOWNSTAIRS
  • WALKING_UPSTAIRS
  • LAYING
  • SITTING
  • STANDING

The remaining 86 variables represent test data that was collected from a specific SubjectID doing a specific ActivityID. The data columns selected are all mean or standard deviation columns. For this analysis, any column that contained either "mean" or "std" (case insensitive) anywhere within the name, was included.

When the variables below are grouped together, it indicates the same measurement has been made but just in a different axis (the axis X, Y or Z is determined by the last character in the variable name.

All the variables below have been normalized and are unit-free.

MEAN_tBodyAccX, MEAN_tBodyAccY, MEAN_tBodyAccZ

Real Number value of the mean of the time domain tBodyAcc measurement.

STD_tBodyAccY, STD_tBodyAccY, STD_tBodyAccZ

Real Number value of the standard deviation of the time domain tBodyAcc measurement.

MEAN_tGravityAccX, MEAN_tGravityAccY, MEAN_tGravityAccZ

Real Number value of the mean of the time domain tGravityAcc measurement.

STD_tGravityAccX, STD_tGravityAccY, STD_tGravityAccZ

Real Number value of the standard deviation of the time domain tGravityAcc measurement.

MEAN_tBodyAccJerkX, MEAN_tBodyAccJerkY, MEAN_tBodyAccJerkZ

Real Number value of the mean of the time domain tBodyAccJerk measurement.

STD_tBodyAccJerkX, STD_tBodyAccJerkY, STD_tBodyAccJerkZ

Real Number value of the standard deviation of the time domain tBodyAccJerk measurement.

MEAN_tBodyGyroX, MEAN_tBodyGyroY, MEAN_tBodyGyroZ

Real Number value of the mean of the time domain tBodyGyro measurement.

STD_tBodyGyroX, STD_tBodyGyroY, STD_tBodyGyroZ

Real Number value of the standard deviation of the time domain tBodyGyro measurement.

MEAN_tBodyGyroJerkX, MEAN_tBodyGyroJerkY, MEAN_tBodyGyroJerkZ

Real Number value of the mean of the time domain tBodyGyroJerk measurement.

STD_tBodyGyroJerkX, STD_tBodyGyroJerkY, STD_tBodyGyroJerkZ

Real Number value of the standard deviation of the time domain tBodyGyroJerk measurement.

MEAN_tBodyAccMag

Real Number value of the mean of the time domain tBodyAccMag measurement.

STD_tBodyAccMag

Real Number value of the standard deviation of the time domain tBodyAccMag measurement.

MEAN_tGravityAccMag

Real Number value of the mean of the time domain tGravityAccMag measurement.

STD_tGravityAccMag

Real Number value of the standard deviation of the time domain tGravityAccMag measurement.

MEAN_tBodyAccJerkMag

Real Number value of the mean of the time domain tBodyAccJerkMag measurement.

STD_tBodyAccJerkMag

Real Number value of the standard deviation of the time domain tBodyAccJerkMag measurement.

MEAN_tBodyGyroMag

Real Number value of the mean of the time domain tBodyGyroMag measurement.

STD_tBodyGyroMag

Real Number value of the standard deviation of the time domain tBodyGyroMag measurement.

MEAN_tBodyGyroJerkMag

Real Number value of the mean of the time domain tBodyGyroJerkMag measurement.

STD_tBodyGyroJerkMag

Real Number value of the standard deviation of the time domain tBodyGyroJerkMag measurement.

MEAN_fBodyAccX, MEAN_fBodyAccY, MEAN_fBodyAccZ

Real Number value of the mean of the frequency domain fBodyAcc measurement.

STD_fBodyAccX, STD_fBodyAccY, STD_fBodyAccZ

Real Number value of the standard deviation of the frequency domain fBodyAcc measurement.

MEAN_fBodyAccFreqX, MEAN_fBodyAccFreqY, MEAN_fBodyAccFreqZ

Real Number value of the mean of the frequency domain fBodyAccFreq measurement.

MEAN_fBodyAccJerkX, MEAN_fBodyAccJerkY, MEAN_fBodyAccJerkZ

Real Number value of the mean of the frequency domain fBodyAccJerk measurement.

STD_fBodyAccJerkX, STD_fBodyAccJerkY, STD_fBodyAccJerkZ

Real Number value of the standard deviation of the frequency domain fBodyAccJerk measurement.

MEAN_fBodyAccJerkFreqX, MEAN_fBodyAccJerkFreqY, MEAN_fBodyAccJerkFreqZ

Real Number value of the mean of the frequency domain fBodyAccJerkFreq measurement.

MEAN_fBodyGyroX, MEAN_fBodyGyroY, MEAN_fBodyGyroZ

Real Number value of the mean of the frequency domain fBodyGyro measurement.

STD_fBodyGyroX, STD_fBodyGyroY, STD_fBodyGyroZ

Real Number value of the standard deviation of the frequency domain fBodyGyro measurement.

MEAN_fBodyGyroFreqX, MEAN_fBodyGyroFreqY, MEAN_fBodyGyroFreqZ

Real Number value of the mean of the frequency domain fBodyGyroFreq measurement.

MEAN_fBodyAccMag

Real Number value of the mean of the frequency domain fBodyAccMag measurement.

STD_fBodyAccMag

Real Number value of the standard deviation of the frequency domain fBodyAccMag measurement.

MEAN_fBodyAccMagFreq

Real Number value of the mean of the frequency domain fBodyAccMagFreq measurement.

MEAN_fBodyBodyAccJerkMag

Real Number value of the mean of the frequency domain fBodyBodyAccJerkMag measurement.

STD_fBodyBodyAccJerkMag

Real Number value of the standard deviation of the frequency domain fBodyBodyAccJerkMag measurement.

MEAN_fBodyBodyAccJerkMagFreq

Real Number value of the mean of the frequency domain fBodyBodyAccJerkMagFreq measurement.

MEAN_fBodyBodyGyroMag

Real Number value of the mean of the frequency domain fBodyBodyGyroMag measurement.

STD_fBodyBodyGyroMag

Real Number value of the standard deviation of the frequency domain fBodyBodyGyroMag measurement.

MEAN_fBodyBodyGyroMagFreq

Real Number value of the mean of the frequency domain fBodyBodyGyroJerkMag measurement.

MEAN_fBodyBodyGyroJerkMag

Real Number value of the mean of the frequency domain fBodyBodyGyroJerkMag measurement.

STD_fBodyBodyGyroJerkMag

Real Number value of the standard deviation of the frequency domain fBodyBodyGyroJerkMag measurement.

MEAN_fBodyBodyGyroJerkMagFreq

Real Number value of the mean of the frequency domain tBodyBodyGyroJerkMagFreq measurement.

MEAN_angle(tBodyAccgravity)

Real Number value of the mean of the time domain angle(tBodyAccgravity) measurement.

MEAN_angle(tBodyAccJerk)gravity

Real Number value of the mean of the time domain angle(tBodyAccJerk) measurement.

MEAN_angle(tBodyGyrogravity)

Real Number value of the mean of the time domain angle(tBodyGyrogravity) measurement.

MEAN_angle(tBodyGyroJerkgravity)

Real Number value of the mean of the time domain angle(tBodyGyroJerkgravity) measurement.

MEAN_angle(Xgravity)

Real Number value of the mean of the angle(gravity) variable in the X axis.

MEAN_angle(Ygravity)

Real Number value of the mean of the angle(gravity) variable in the Y axis.

MEAN_angle(Zgravity)

Real Number value of the mean of the angle(gravity) variable in the Z axis.