run_analysis.R - This is the only script. See the script for detailed processing notes.
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The class project page implies that the script will be tested in the directory immediately above the unzipped UCI HAR Dataset directory containing the already downloaded and unzipped data. Alternatively work_dir can be set and create_work_dir_and_download_data set to TRUE at the top of the script to have the work directory created and the data downloaded.
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The data.table and tidyr packages are required.
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A tidy_data_set.txt file is written to the work directory containing the required project script result.