G-C-Data-Course-Project/Codebook.txt at master · yonathanta/G-C-Data-Course-Project · GitHub

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CODEBOOK
Getting and Cleaning Data Course Project


1. tidy_data_with averages

	Activity 		(1.WALKING
 2.WALKING_UPSTAIRS
3.WALKING_DOWNSTAIRS
4.SITTING
 5.STANDING
6.LAYING
)
	subjects 		(Individuals participating in the training and test group. Value range from 1 to 30)


"tBodyAccMeanX" ( mean of time domain linear accelerometer x-axis raw signals)
"tBodyAccMeanY" ( mean of time domain linear accelerometer y-axis raw signals)
"tBodyAccMeanZ" ( mean of time domain linear accelerometer z-axis raw signals)
"tBodyAccStdX"  ( standard devaition of time domain accelerometer x-axis raw signals)
"tBodyAccStdY"  ( standard devaition of time domain accelerometer y-axis raw signals)
"tBodyAccStdZ"   ( standard devaition of time domain accelerometer z-axis raw signals)


	(The followings 6 variables are mean and standard devaitions of time domain linear acceleration of device 3-axial raw signals)

"tGravityAccMeanX"
"tGravityAccMeanY"
"tGravityAccMeanZ"
"tGravityAccStdX"
"tGravityAccStdY"
"tGravityAccStdZ"


	(The followings 6 variables are mean and standard devaitions of time domain acceleration of device due to body jerk 3-axial raw signals)

"tBodyAccJerkMeanX"
"tBodyAccJerkMeanY"
"tBodyAccJerkMeanZ"
"tBodyAccJerkStdX"
"tBodyAccJerkStdY"
"tBodyAccJerkStdZ"

	(The followings 6 variables are mean and standard devaitions of time domain body angular velocity vector measured by the gyroscope of the device)

"tBodyGyroMeanX"
"tBodyGyroMeanY"
"tBodyGyroMeanZ"
"tBodyGyroStdX"
"tBodyGyroStdY"
"tBodyGyroStdZ"

	(The followings 6 variables are mean and standard devaitions of time domain body jerk signals derived from the linear acceleration and angular velocity)

"tBodyGyroJerkMeanX"
"tBodyGyroJerkMeanY"
"tBodyGyroJerkMeanZ"
"tBodyGyroJerkStdX"
"tBodyGyroJerkStdY"
"tBodyGyroJerkStdZ"

	(magnitude)

	"tBodyAccMagMean"
	"tBodyAccMagStd"

	"tGravityAccMagMean"
	"tGravityAccMagStd"

	"tBodyAccJerkMagMean"
	"tBodyAccJerkMagStd"

	"tBodyGyroMagMean"
	"tBodyGyroMagStd"

	"tBodyGyroJerkMagMean"
	"tBodyGyroJerkMagStd"

	(The mean and standard devaitions of frequency domain linear acceleration of device 3-axial raw signals)

	"fBodyAccMeanX"
	"fBodyAccMeanY"
	"fBodyAccMeanZ"
	"fBodyAccStdX"
	"fBodyAccStdY"
	"fBodyAccStdZ"

	(The followings 6 variables are mean and standard devaitions of frequency domain acceleration of device due to body jerk 3-axial raw signals)

	"fBodyAccJerkMeanX"
	"fBodyAccJerkMeanY"
	"fBodyAccJerkMeanZ"
	"fBodyAccJerkStdX"
	"fBodyAccJerkStdY"
	"fBodyAccJerkStdZ"

	(The followings 6 variables are mean and standard devaitions of frequency domain body angular velocity vector measured by the gyroscope of the device)

	"fBodyGyroMeanX"
	"fBodyGyroMeanY"
	"fBodyGyroMeanZ"
	"fBodyGyroStdX"
	"fBodyGyroStdY"
	"fBodyGyroStdZ

	(Magnitude)


	"fBodyAccMagMean"
	"fBodyAccMagStd"

	"fBodyBodyAccJerkMagMean"
	"fBodyBodyAccJerkMagStd"

	"fBodyBodyGyroMagMean"
	"fBodyBodyGyroMagStd"

	"fBodyBodyGyroJerkMagMean"
	"fBodyBodyGyroJerkMagStd"


2. tidy_data_with_averages
	this data frame contains the computed mean values of the above variables for each subject and activity