activitysubjectmeansDS.csv: the output file with the tidy data set

CodeBook.md: the code book describing, data, variables, operations on data

README.md: this file

tidyData.R: the R script for executing the five steps required by the Peer Assessments.

          the file must be copied into a folder having as subfolders the test and train folders with the sampled data 

          the script in the file must be executed in the above folder

          the script is executed from R prompt via the command     source("tidyData.R")