---
title: Courseras' Getting and Cleaning Data Course Project Codebook.
author: k.e.s.peters
date: 21-jun-2015
output:
html_document:
keep_md: yes
---
This code book will only explain the variables of the final dataset (tidy_data.txt). Please consult the README.md for information about how the tidy_data was created.
tidy_data dimension: 180 rows, 68 columns
1: subject description: subject number class: integer range: 1 to 30
2: activity description: descriptive activity name class: character range: WALKING WALKING_UPSTAIRS WALKING_DOWNSTAIRS SITTING STANDING LAYING
3: tBodyAcc-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the body acceleration in the X-direction' class: numeric NOTE: original values were 'standardized Z values' ranging between -1 and 1
4: tBoddyAcc-mean()-Y description: aggregated mean of the 'standardized mean from thetime domain of the body acceleration in the Y-direction' class: numeric
5: tBoddyAcc-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the body acceleration in the Z-direction' class: numeric
6: tBodyAcc-std()-X description: aggregated mean of the 'standardized std from the time domain of the body acceleration in the X-direction' class: numeric
7: tBodyAcc-std()-Y description: aggregated mean of the 'standardized std from the time domain of the body acceleration in the Y-direction' class: numeric
8: tBodyAcc-std()-Z description: aggregated mean of the 'standardized std from the time domain of the body acceleration in the Z-direction' class: numeric
9: tGravityAcc-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the gravity acceleration in the X-direction' class: numeric
10: tGravityAcc-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the gravity acceleration in the Y-direction' class: numeric
11: tGravityAcc-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the gravity acceleration in the Z-direction' class: numeric
12: tGravityAcc-std()-X description: aggregated mean of the 'standardized std from the time domain of the gravity acceleration in the X-direction' class: numeric
13: tGravityAcc-std()-Y description: aggregated mean of the 'standardized std from the time domain of the gravity acceleration in the Y-direction' class: numeric
14: tGravityAcc-std()-Z description: aggregated mean of the 'standardized std from the time domain of the gravity acceleration in the Z-direction' class: numeric
15: tBodyAccJerk-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the body jerk in the X-direction' class: numeric
16: tBodyAccJerk-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the body jerk in the Y-direction' class: numeric
17: tBodyAccJerk-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the body jerk in the Z-direction' class: numeric
18: tBodyAccJerk-std()-X description: aggregated mean of the 'standardized std from the time domain of the body jerk in the X-direction' class: numeric
19: tBodyAccJerk-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the body jerk in the Y-direction' class: numeric
20: tBodyAccJerk-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the body jerk in the Z-direction' class: numeric
21: tBodyGyro-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope in the X-direction' class: numeric
22: tBodyGyro-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope in the Y-direction' class: numeric
23: tBodyGyro-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope in the X-direction' class: numeric
24: tBodyGyro-std()-X description: aggregated mean of the 'standardized std from the time domain of the body gyroscope in the X-direction' class: numeric
25: tBodyGyro-std()-Y description: aggregated mean of the 'standardized std from the time domain of the body gyroscope in the Y-direction' class: numeric
26: tBodyGyro-std()-Z description: aggregated mean of the 'standardized std from the time domain of the body gyroscope in the Z-direction' class: numeric
27: tBodyGyroJerk-mean()-X description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope jerk in the X-direction' class: numeric
28: tBodyGyroJerk-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope jerk in the Y-direction' class: numeric
29: tBodyGyroJerk-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope jerk in the Z-direction' class: numeric
30: tBodyGyroJerk-std()-X description: aggregated mean of the 'standardized std from the time domain of the body gyroscope jerk in the X-direction' class: numeric
31: tBodyGyroJerk-mean()-Y description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope jerk in the Y-direction' class: numeric
32: tBodyGyroJerk-mean()-Z description: aggregated mean of the 'standardized mean from the time domain of the body gyroscope jerk in the Z-direction' class: numeric
33: tBodyAccMag-mean() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm mean from the time domain of body acceleration magnitude' class: numeric
34: tBodyAccMag-std() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm std from the time domain of body acceleration magnitude' class: numeric
35: tGravityAccMag-mean() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm mean from the time domain of gravity acceleration magnitude' class: numeric
36: tGravityAccMag-std() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm std from the time domain of gravity acceleration magnitude' class: numeric
37: tBodyAccJerkMag-mean() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm mean from the time domain of body acceleration jerk magnitude' class: numeric
38: tBodyAccJerkMag-std() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm std from the time domain of body acceleration jerk magnitude' class: numeric
39: tBodyGyroMag-mean() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm mean from the time domain of body gryoscope magnitude' class: numeric
40: tBodyGyroMag-std() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm std from the time domain of body gryoscope magnitude' class: numeric
41: tBodyGyroJerkMag-mean() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm mean from the time domain of body gryoscope jerk magnitude' class: numeric
42: tBodyGyroJerkMag-std() description: aggregated mean of the 'three-dimeansional standardized Euclidean norm std from the time domain of body gryoscope jerk magnitude' class: numeric
43: fBodyAcc-mean()-X description: aggregated mean of the 'standardized mean from the frequency domain of the body acceleration in the X-direction' class: numeric NOTE: original values were 'standardized Z values' ranging between -1 and 1
44: fBoddyAcc-mean()-Y description: aggregated mean of the 'standardized mean from the frequency domain of the body acceleration in the Y-direction' class: numeric
45: fBoddyAcc-mean()-Z description: aggregated mean of the 'standardized mean from the frequency domain of the body acceleration in the Z-direction' class: numeric
46: fBodyAcc-std()-X description: aggregated mean of the 'standardized std from the frequency domain of the body acceleration in the X-direction' class: numeric
47: fBodyAcc-std()-Y description: aggregated mean of the 'standardized std from the frequency domain of the body acceleration in the Y-direction' class: numeric
48: fBodyAcc-std()-Z description: aggregated mean of the 'standardized std from the frequency domain of the body acceleration in the Z-direction' class: numeric
49: fBodyAccJerk-mean()-X description: aggregated mean of the 'standardized mean from the frequency domain of the body jerk in the X-direction' class: numeric
50: fBodyAccJerk-mean()-Y description: aggregated mean of the 'standardized mean from the frequency domain of the body jerk in the Y-direction' class: numeric
51: fBodyAccJerk-mean()-Z description: aggregated mean of the 'standardized mean from the frequency domain of the body jerk in the Z-direction' class: numeric
52: fBodyAccJerk-std()-X description: aggregated mean of the 'standardized std from the frequency domain of the body jerk in the X-direction' class: numeric
53: fBodyAccJerk-mean()-Y description: aggregated mean of the 'standardized mean from the frequency domain of the body jerk in the Y-direction' class: numeric
54: fBodyAccJerk-mean()-Z description: aggregated mean of the 'standardized mean from the freaquency domain of the body jerk in the Z-direction' class: numeric
55: fBodyGyro-mean()-X description: aggregated mean of the 'standardized mean from the frequency domain of the body gyroscope in the X-direction' class: numeric
56: fBodyGyro-mean()-Y description: aggregated mean of the 'standardized mean from the frequency domain of the body gyroscope in the Y-direction' class: numeric
57: fBodyGyro-mean()-X description: aggregated mean of the 'standardized mean from the frequency domain of the body gyroscope in the X-direction' class: numeric
58: fBodyGyro-std()-X description: aggregated mean of the 'standardized std from the frequency domain of the body gyroscope in the X-direction' class: numeric
59: fBodyGyro-std()-Y description: aggregated mean of the 'standardized std from the frequency domain of the body gyroscope in the Y-direction' class: numeric
60: fBodyGyro-std()-Z description: aggregated mean of the 'standardized std from the frequency domain of the body gyroscope in the Z-direction' class: numeric
61: fBodyAccMag-mean() description: aggregated mean of the 'three-dimensional standardized Euclidean norm mean from the frequency domain of body acceleration magnitude' class: numeric
62: fBodyAccMag-std() description: aggregated mean of the 'three-dimensional standardized Euclidean norm std from the frequency domain of body acceleration magnitude' class: numeric
63: fBodyBodyAccJerkMag-mean() description: aggregated mean of the 'three-dimensional standardized Eucldean norm mean from the frequency domain of body body acceleration jerk magnitude' class: numeric
64: fBodyBodyAccJerkMag-std() description: aggregated mean of the 'three-dimensional standardized Eucldean norm std from the frequency domain of body body acceleration jerk magnitude' class: numeric
65: fBodyBodyFyroMag-mean() description: aggregated mean of the 'three-dimensional standardized Eucldean norm mean from the frequency domain of body body gyroscope magnitude' class: numeric
66: fBodyBodyFyroMag-std() description: aggregated mean of the 'three-dimensional standardized Eucldean norm std from the frequency domain of body body gyroscope magnitude' class: numeric
67: fBodyBodyGyroJerkMag-mean() description: aggregated mean of the 'three-dimensional standardized Eucldean norm mean from the frequency domain of body body gyroscope jerk magnitude' class: numeric
68: fBodyBodyGyroJerkMag-std() description: aggregated mean of the 'three-dimensional standardized Eucldean norm std from the frequency domain of body body gyroscope jerk magnitude' class: numeric