Coursera Tidy Data Project

for class getdata002
William J Highsmith
whighsmith@gmail.com

About

The run_analysis.R file extracts data for the Coursera Getting and Cleaning Data class project.

The data source is the Human Activity Recognition Using Smartphones Data Set at UCI's Center for Machine Learning and Intelligent Systems. More information about the data can be found at: http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones

data source: http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones

runanalysis.R

Read Data

The script reads in 8 files:
1.test data
2.train data
3.test subject identifier
4.train subject identifier
5.variable names
6.activity index for test data
7.activity index for train data
8.activity names

Processing

Assemble Tidy data set
-SubjectID & Activity index is bound to data sets.
-Column names applied.
-Variable columns filtered by name to only include the measurements of "*mean()" or "*std()".
-Append test and train data sets using rbind.
-Row names assigned via the activity index merged with activity names.
-Aggregate the mean of each variable across Subject and ActivityName

Output

activityName
subject

The following variables are the mean of raw data variables (grouped by activityName and subject)
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()