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README.md

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Getting and Cleaning Data Project

The data linked to from the course website represent data collected from the accelerometers from the Samsung Galaxy S smartphone. A full description is available at the site where the data was obtained: http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones

Files

  • README.md -- this file
  • CodeBook.md -- codebook describing variables, the data and transformations
  • run_analysis.R -- actual R code

Environment

It should run in a folder of the Samsung data (the zip had this folder: UCI HAR Dataset) The script assumes it has in it's working directory the following files and folders:

  • activity_labels.txt
  • features.txt
  • test/
  • train/

Script run_analysis.R

  • For each data set:

    • read data set
    • attach activity labels
    • attach subject

  • Merge all data sets.

  • Rename variables of the data set.

  • Keep only activity, subject, "mean", "std" variables in data set.

  • Create a new data frame by finding the mean for each combination of subject and label.

  • Write data to "tidy.txt" file in the working directory