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README.md

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Creating and documenting a Tidy Data Set
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This repository includes the following:

  • This file -- README.md

  • The R code to create the tidy dataset -- run_analysis.R

  • The codebook showing the new dataset and info about the source data as well. -- CodeBook.md

Explanation of run_analysis.R file

The following steps were performed in the R file to create the tidy data set:

  • setup for Windows 7 OS

  • Download and unzip zipped data

  • read all the data into R

  • Set column names in main data sets

  • Find the columns whose names contain "mean" or "std"

  • select only the columns indicating means or standard deviations

  • add columns for Subject and Activities

  • Combine test and train data by rows into one large data set

  • Name the first two columns that contain Activities and Subjects

  • Provide nice variable names to the columns

  • Change data frame to a data table with Activities and Subjects as keys

  • Change Activities and Subjects to factors

  • Create tidy data set with means for each variable by Activities and Subject