1. a tidy data set (https://github.com/XiarongIris/GettingandCleaningDataCourseProject/blob/master/data_means.txt) based on the original data set: [data_means.txt]
2. an R script called [run_analysis.R] (https://github.com/XiarongIris/GettingandCleaningDataCourseProject/blob/master/run_analysis.R)for performing the analysis
3. a code book (CodeBook.md) (https://github.com/XiarongIris/GettingandCleaningDataCourseProject/blob/master/CodeBook.m) that describes variables, data and any transformations or work performed to clean up the data