getdata-017

Getting and Cleaning Data Course : week 3 Project https://class.coursera.org/getdata-017

run_analysis.R is the R script to analysis data .

The analysis flow is :

1. load library
2. load data
3. Merges the training and the test sets to create one data set.
4. Extracts only the measurements on the mean and standard deviation for each measurement.
5. Uses descriptive activity names to name the activities in the data set
6. Appropriately labels the data set with descriptive variable names.
7. 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.
8. output and view result

codebook.txt is the code book to show variables used in R .