Getting and Cleaning Data Project

Criteria

1. The submitted data set is tidy.
2. The Github repo contains the required scripts.
3. GitHub contains a code book that modifies and updates the available codebooks with the data to indicate all the variables and summaries calculated, along with units, and any other relevant information.
4. The README that explains the analysis files is clear and understandable.
5. The work submitted for this project is the work of the student who submitted it.

Instructions

The purpose of this project is to demonstrate your ability to collect, work with, and clean a data set. The goal is to prepare tidy data that can be used for later analysis. You will be graded by your peers on a series of yes/no questions related to the project. You will be required to submit: 1) a tidy data set as described below, 2) a link to a Github repository with your script for performing the analysis, and 3) a code book that describes the variables, the data, and any transformations or work that you performed to clean up the data called CodeBook.md. You should also include a README.md in the repo with your scripts. This repo explains how all of the scripts work and how they are connected.

One of the most exciting areas in all of data science right now is wearable computing - see for example this article . Companies like Fitbit, Nike, and Jawbone Up are racing to develop the most advanced algorithms to attract new users. 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

Here are the data for the project:

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

You should create one R script called run_analysis.R that does the following.

1. Merges the training and the test sets to create one data set.
2. Extracts only the measurements on the mean and standard deviation for each measurement.
3. Uses descriptive activity names to name the activities in the data set
4. Appropriately labels the data set with descriptive variable names.
5. From the data set in step 4, creates a second, independent tidy data set with the average of each variable for each activity and each subject. Good luck!

Input

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

Analysis Script

run_analysis.R: this script takes the input data, and creates the output file.

After download and unzip the file from the link above:

1. Merge the test and training sets to create one data set.

2. Use the features.txt to identify the activity names and makes the data easir to human reading.

3. Use the activity_labels.txt to identify and select just the measurements that represents mean or standart deviation.

4. Merge the features, activity and subject in one raw dataset, with features names and activity labels. That content is saved at dataset.txt.

5. Grouped the data using subject and activity allowing group computations.

6. Used the grouped information to calculate the average for each pair of dimensions (Activity-Subject). That content is saved at dataset_summarized.txt.

Outputs

• raw dataset: dataset.txt
• summarized dataset: dataset_summarized.txt

Code Book

CodeBook.md: describes the proccess done to clean the data, the variables used in the procces and the output for this project.