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Generation of a summarized dataset based on the 'Human Activity Recognition Using Smartphones Dataset' from UCI

About the Original Dataset

The original dataset is fully documented at http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones

This is the dataset we start with for generating the summarized dataset documented in this README.

The original dataset consists of several files (organized in multiple folders) in a single ZIP archive file. After downloading and unziping the archive one can explore the multiple files, starting with the README.txt, which explains the content more in details.

About the Summarized Dataset

We generate the summarized dataset in a single file called uci_har_summarized_data.txt.

Please refer to next section for more details about how to (re)generate it.

The file content is in table format. One may read in R using the following command (assuming the file is located in one's working directory): uciHarSummarizedData <- read.table("uci_har_summarized_data.txt", header = TRUE)

Besides the header line, this file contains one line per subject and activity (executed by said subject) covered by the original dataset.

Then, there is one column describing the subject, one column describing the activity and multiple columns describing the various 'measures' of interest.

Please refer to CodeBook.md for more details about the file content.

How to Generate the Summarized Dataset

All the R instructions required to generate the data are in run_analysis.R, but you need to separately download the original dataset (prepackaged ZIP file) first.

  1. Download https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip

  2. Unzip the previous archive into a folder located wherever you wish on your machine.

  3. Setup that folder (from step 2) as the working directory in your R session.

  4. If not already the case, please install the dplyr package in your R environment.

  5. Run the run_analysis.R script... Upon successful completion (otherwise, please check the error messages) you shall find a uci_har_summarized_data.txt file in the working directory.