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code book.txt
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The result.txt is the average of each variable for each activity and each subject. And the variable come from the accelerometer and gyroscope 3-axial raw signals tAcc-XYZ and tGyro-XYZ. These time domain signals (prefix 't' to denote time) were captured at a constant rate of 50 Hz. Then they were filtered using a median filter and a 3rd order low pass Butterworth filter with a corner frequency of 20 Hz to remove noise. Similarly, the acceleration signal was then separated into body and gravity acceleration signals (tBodyAcc-XYZ and tGravityAcc-XYZ) using another low pass Butterworth filter with a corner frequency of 0.3 Hz.
Subsequently, the body linear acceleration and angular velocity were derived in time to obtain Jerk signals (tBodyAccJerk-XYZ and tBodyGyroJerk-XYZ). Also the magnitude of these three-dimensional signals were calculated using the Euclidean norm (tBodyAccMag, tGravityAccMag, tBodyAccJerkMag, tBodyGyroMag, tBodyGyroJerkMag).
Finally a Fast Fourier Transform (FFT) was applied to some of these signals producing fBodyAcc-XYZ, fBodyAccJerk-XYZ, fBodyGyro-XYZ, fBodyAccJerkMag, fBodyGyroMag, fBodyGyroJerkMag. (Note the 'f' to indicate frequency domain signals).
These signals were used to estimate variables of the feature vector for each pattern:
'-XYZ' is used to denote 3-axial signals in the X, Y and Z directions.
variable:
subject： the volunteer's number
activity: describe 6 activity
1 WALKING
2 WALKING_UPSTAIRS
3 WALKING_DOWNSTAIRS
4 SITTING
5 STANDING
6 LAYING
tbodyacc-mean-x
tbodyacc-mean-y
tbodyacc-mean-z
tbodyacc-std-x
tbodyacc-std-y
tbodyacc-std-z
tgravityacc-mean-x
tgravityacc-mean-y
tgravityacc-mean-z
tgravityacc-std-x
tgravityacc-std-y
tgravityacc-std-z
tbodyaccjerk-mean-x
tbodyaccjerk-mean-y
tbodyaccjerk-mean-z
tbodyaccjerk-std-x
tbodyaccjerk-std-y
tbodyaccjerk-std-z
tbodygyro-mean-x
tbodygyro-mean-y
tbodygyro-mean-z
tbodygyro-std-x
tbodygyro-std-y
tbodygyro-std-z
tbodygyrojerk-mean-x
tbodygyrojerk-mean-y
tbodygyrojerk-mean-z
tbodygyrojerk-std-x
tbodygyrojerk-std-y
tbodygyrojerk-std-z
tbodyaccmag-mean
tbodyaccmag-std
tgravityaccmag-mean
tgravityaccmag-std
tbodyaccjerkmag-mean
tbodyaccjerkmag-std
tbodygyromag-mean
tbodygyromag-std
tbodygyrojerkmag-mean
tbodygyrojerkmag-std
fbodyacc-mean-x
fbodyacc-mean-y
fbodyacc-mean-z
fbodyacc-std-x
fbodyacc-std-y
fbodyacc-std-z
fbodyaccjerk-mean-x
fbodyaccjerk-mean-y
fbodyaccjerk-mean-z
fbodyaccjerk-std-x
fbodyaccjerk-std-y
fbodyaccjerk-std-z
fbodygyro-mean-x
fbodygyro-mean-y
fbodygyro-mean-z
fbodygyro-std-x
fbodygyro-std-y
fbodygyro-std-z
fbodyaccmag-mean
fbodyaccmag-std
fbodybodyaccjerkmag-mean
fbodybodyaccjerkmag-std
fbodybodygyromag-mean
fbodybodygyromag-std
fbodybodygyrojerkmag-mean
fbodybodygyrojerkmag-std