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R Data Science Course from John Hopkins assignment to get a clean a data set.

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Repository for Getting & Cleaning Data John Hopkins Data Science Coursera Course

  • Assignment is to create a tidy data set from this data: https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip
  • Comments in code, but generally:
  • Data was taken from both training and final test data sets;
  • The data set was mined for individual tables which then had common names substituted for various activity codes;
  • Data set further broken apart to identify the mean and standard deviation of various axial movements of the holder of a cellular phone during the activities;
  • Data was merged into a final data set, identifying each individual subject (phone user), activity engaged in, and axial motions mean/standard deviation.
  • To replicate, download data and unzip into directory: UCI_HAR_Dataset (the default unzip directory), then run script.
  • Script generates output CSV file "Clean_HAR_data.csv" in your working directory.

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R Data Science Course from John Hopkins assignment to get a clean a data set.

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