Ideas for this cookbook courtesy of https://class.coursera.org/getdata-004/forum/thread?thread_id=267.
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Included only variables that had names that included "mean()" or "std()" to limit the variables to just means and standard deviations of the measurements.
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The names of the columns were provided in the zipped data folder in the "features.txt" file.
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The original data can be downloaded from the link provided in the assignment: https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip .