Data_Analysis/CodeBook.Rmd at master · Saif178/Data_Analysis · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
---
title: "Codebook"
output: html_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

## Variables of the columns

"subject"               "activitylabel"         "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"

# Description of the Variables

activity label - all the activities performed by the subjects like - Walking,  Walking Upstairs, Walking downstairs, Sitting, Standing and Laying

Subjects - the people who have performed the activities. For privacy purpose, the subjects have been given numbers.

All the subjects were attached with Samsung Galaxy II around their body and the accelerometer and gyrometer values were recorded and they were subjected to Fourier transformation giving the movement values in X, Y and Z directions and then, the mean and standard deviation of the values were obtained.