This R script is used to fulfill the task of the Coursera course - Getting and cleaning data

„You should create one R script called run_analysis.R that does the following. 1 Merges the training and the test sets to create one data set. 2 Extracts only the measurements on the mean and standard deviation for each measurement. 3 Uses descriptive activity names to name the activities in the data set 4 Appropriately labels the data set with descriptive variable names. 5 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.“

Direct run run_analysis.R script, you will get a txt file, which stores the demanded aggregated data frame. CodeBook.md describes in detail how the script transform the data.