The data linked to from the course website represent data collected from the accelerometers from the Samsung Galaxy S smartphone. A full description is available at the site where the data was obtained:

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

Here are the data for the project:

https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip

R Script run_analysis.R does the following.

- Merges the training and the test sets to create one data set.
- Extracts only the measurements on the mean and standard deviation for each measurement. 
- Uses descriptive activity names to name the activities in the data set
- Appropriately labels the data set with descriptive variable names. 
- From the data set in step 4, creates a second, independent tidy data set with the average of each variable for each activity and each subject.

set working directory to the data folder e.g. getdata_projectfiles_UCI HAR Dataset\UCI HAR Dataset run the R analysis code