"Getting And Cleaning Data" Assignment

The Assignment

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 activity names.
5. Creates a second, independent tidy data set with the average of each variable for each activity and each subject.

Files

• README.md: This document
• CodeBook.md: Codebook describing variables, data, and transformations
• run_analysis.R: R code

Steps

1. Run source("run_analysis.R").
2. The script creates "data" folder under the current working directory, that is "./data".
3. The script downloads the data (a zip file) and unzips files under the "./data" folder.
4. The script loads data from various text files, merges, and aggregates data as appropriate.
5. Finally, a tidy data file, tidy.txt, is written under the current working directory.

Dependencies

run_analysis.R uses dplyr and data.table packages. The script installs them if not already installed.