The R script (run_analysis.R) reads the data from the UCI HAR Dataset directory.
It combines the datasets in the 'test' and 'training' directories. It extracts
the columns of the dataset that contain
averages and standard deviations for particular measurements during the trial, along with
the corresponding Subject_ID and Activity_Name.
The mean for each subject's measurement is computed by taking all of the trials
for a given activity for each subject (Ex. take the mean of measurements for
subject 1 for all RUNNING_UPSTAIRS trials). The means of all the standard
deviations and means are printed to a file called TidyAverages.txt.
There are 180 rows of data (30 subjects * 6 activities). Each column
contains an average of the data type listed under Data about motion obtained
from phone.
##Data Source The directory UCI HAR Dataset directory must be in the directory from which the run_analysis.R script is called. The data can be obtained from: http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones
#Columns in the dataset: "Subject_ID" - the subject's identification number
"Activity_Name" - the activity being performed while data was collected
###Data about motion obtained from the phone "tBodyAcc-mean()-X"
"tBodyAcc-mean()-Y"
"tBodyAcc-mean()-Z"
"tGravityAcc-mean()-X"
"tGravityAcc-mean()-Y"
"tGravityAcc-mean()-Z"
"tBodyAccJerk-mean()-X"
"tBodyAccJerk-mean()-Y"
"tBodyAccJerk-mean()-Z"
"tBodyGyro-mean()-X"
"tBodyGyro-mean()-Y"
"tBodyGyro-mean()-Z"
"tBodyGyroJerk-mean()-X"
"tBodyGyroJerk-mean()-Y"
"tBodyGyroJerk-mean()-Z"
"tBodyAccMag-mean()"
"tGravityAccMag-mean()"
"tBodyAccJerkMag-mean()"
"tBodyGyroMag-mean()"
"tBodyGyroJerkMag-mean()"
"fBodyAcc-mean()-X"
"fBodyAcc-mean()-Y"
"fBodyAcc-mean()-Z"
"fBodyAccJerk-mean()-X"
"fBodyAccJerk-mean()-Y"
"fBodyAccJerk-mean()-Z"
"fBodyGyro-mean()-X"
"fBodyGyro-mean()-Y"
"fBodyGyro-mean()-Z"
"fBodyAccMag-mean()"
"fBodyBodyAccJerkMag-mean()"
"fBodyBodyGyroMag-mean()"
"fBodyBodyGyroJerkMag-mean()"
"tBodyAcc-std()-X"
"tBodyAcc-std()-Y"
"tBodyAcc-std()-Z"
"tGravityAcc-std()-X"
"tGravityAcc-std()-Y"
"tGravityAcc-std()-Z"
"tBodyAccJerk-std()-X"
"tBodyAccJerk-std()-Y"
"tBodyAccJerk-std()-Z"
"tBodyGyro-std()-X"
"tBodyGyro-std()-Y"
"tBodyGyro-std()-Z"
"tBodyGyroJerk-std()-X"
"tBodyGyroJerk-std()-Y"
"tBodyGyroJerk-std()-Z"
"tBodyAccMag-std()"
"tGravityAccMag-std()"
"tBodyAccJerkMag-std()"
"tBodyGyroMag-std()"
"tBodyGyroJerkMag-std()"
"fBodyAcc-std()-X"
"fBodyAcc-std()-Y"
"fBodyAcc-std()-Z"
"fBodyAccJerk-std()-X"
"fBodyAccJerk-std()-Y"
"fBodyAccJerk-std()-Z"
"fBodyGyro-std()-X"
"fBodyGyro-std()-Y"
"fBodyGyro-std()-Z"
"fBodyAccMag-std()"
"fBodyBodyAccJerkMag-std()"
"fBodyBodyGyroMag-std()"
"fBodyBodyGyroJerkMag-std()"