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Codebook.md |
Anonymous |
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This document describes a summary dataset built upon original raw data procured by scientists at the University of California at Irvine. The raw data consists of measurements of motile activity of test and training subjects using the Samsung smartphones. The raw measurements include 3 dimensional acceleration and gravitational measurements from the smartphone's accelerometer and similar gyroscopic measurements from the smartphone's gyroscope. Generally time based and frequency based measurements have been provided in the raw data, the latter being provided by using the Fast Fourier Transform to calculate the frequency domain counterpart to the time domain measurements.
A full description is available at the site where the raw data was obtained:
http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones
The original raw data can be obtained below:
https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip
The above download file is a zip file which can be unzipped into a directory in your PC.
- Downloaded File using above web site.
- Unzipped downloaded file into RStudio working directory.
- Run provided run_analysis.R
- The previous step will summarize the raw data into upload.txt
The run_analysis program performs the following 5 high level steps.
- Merges the training and the test sets to create one data set.
- Extracts only the measurements on the mean and standard deviation for each measurement.
- Uses descriptive activity names to name the activities in the data set
- Appropriately labels the data set with descriptive variable names.
- 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.
The final summary dataset uploaded using upload.txt conforms to the following four tidy data rules.
This above rule is implemented in the run_analysis function by COMBINING the TEST and the TRAUN measurement datasets and thereby ensuring that data distributed between the TEST and TRAIN datasets have been combined into one dataset with the same column names.
Although the combination of the two TRAIN and TEST datasets had different observations of the same variable in different rows, since our objective is to provide a Summary of all of the data, we, by definition will not have multiple observations of the same variable as we are providing aggregated information.
Our final product, the summary dataset in upload.txt only contains one table, thus automatically adhering to this above precept.
The original raw data tables did not adhere to this precept as the subject and the Y files did not have link columns to the X file. However, our summary dataset does have the personid and activity columns which function as links if needed.
This section describes each column of data provided in the upload.txt dataset.
- personid
Size: 2
Notation: Numeric
Type: Integer
A unique identifier which anonymously enumerates the person from whon the smartphone measurements were recorded.
- activity
Size: 20
Notation: Character
Type: ASCII
An easy to read string which describes which activity the subject was engaged in when the measurement was recorded. Valid values are WALKING,WALKING UPSTAIRS,WALKING DOWNSTAIRS,SITTING,STANDING,LAYING
- timebodyaccelerationaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average acceleration in X direction
- timebodyaccelerationaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average acceleration in Y direction
- timebodyaccelerationaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average acceleration in Z direction
- timebodyaccelerationstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of acceleration in X direction
- timebodyaccelerationstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of acceleration in Y direction
- timebodyaccelerationstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of acceleration in Z direction
- timegravityaccelerationaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced average acceleration in X direction
- timegravityaccelerationaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced average acceleration in Y direction
- timegravityaccelerationaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced average acceleration in Z direction
- timegravityaccelerationstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced standard deviation of acceleration in X direction
- timegravityaccelerationstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced standard deviation of acceleration in Y direction
- timegravityaccelerationstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced standard deviation of acceleration in Z direction
- timebodyaccelerationjerkaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average jerky acceleration in X direction
- timebodyaccelerationjerkaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average jerky acceleration in Y direction
- timebodyaccelerationjerkaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average jerky acceleration in Z direction
- timebodyaccelerationjerkstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in X direction
- timebodyaccelerationjerkstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in Y direction
- timebodyaccelerationjerkstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in Z direction
- timebodygyroscopeaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic movement reading in X direction
- timebodygyroscopeaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic movement reading in Y direction
- timebodygyroscopeaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic movement reading in Z direction
- timebodygyroscopestandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in X direction
- timebodygyroscopestandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in Y direction
- timebodygyroscopestandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in Z direction
- timebodygyroscopejerkaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic jerky movement reading in X direction
- timebodygyroscopejerkaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic jerky movement reading in Y direction
- timebodygyroscopejerkaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's average gyroscopic jerky movement reading in Z direction
- timebodygyroscopejerkstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic jerky movement reading in X direction
- timebodygyroscopejerkstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic jerky movement reading in Y direction
- timebodygyroscopejerkstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of gyroscopic jerky movement reading in Z direction
- timebodyaccelerationmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of acceleration
- timebodyaccelerationmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of acceleration
- timegravityaccelerationmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced Average of Eclidean norm magnitude of acceleration
- timegravityaccelerationmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of gravity induced standard deviation of Eclidean norm magnitude of acceleration
- timebodyaccelerationjerkmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of jerk acceleration
- timebodyaccelerationjerkmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of jerk acceleration
- timebodygyroscopemagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic movement reading
- timebodygyroscopemagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of gyroscopic movement reading
- timebodygyroscopejerkmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic jerky movement reading
- timebodygyroscopejerkmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Time Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of gyroscopic jerky movement reading
- frequencydomainbodyaccelerationaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration in X direction
- frequencydomainbodyaccelerationaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration in Y direction
- frequencydomainbodyaccelerationaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration in Z direction
- frequencydomainbodyaccelerationstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of acceleration in X direction
- frequencydomainbodyaccelerationstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of acceleration in Y direction
- frequencydomainbodyaccelerationstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of acceleration in Z direction
- frequencydomainbodyaccelerationaveragefrequencyx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration by frequency in X direction
- frequencydomainbodyaccelerationaveragefrequencyy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration by frequency in Y direction
- frequencydomainbodyaccelerationaveragefrequencyz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average acceleration by frequency in Z direction
- frequencydomainbodyaccelerationjerkaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration in X direction
- frequencydomainbodyaccelerationjerkaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration in Y direction
- frequencydomainbodyaccelerationjerkaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration in Z direction
- frequencydomainbodyaccelerationjerkstandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in X direction
- frequencydomainbodyaccelerationjerkstandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in Y direction
- frequencydomainbodyaccelerationjerkstandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of jerky acceleration in Z direction
- frequencydomainbodyaccelerationjerkaveragefrequencyx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration by frequency in X direction
- frequencydomainbodyaccelerationjerkaveragefrequencyy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration by frequency in Y direction
- frequencydomainbodyaccelerationjerkaveragefrequencyz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average jerky acceleration by frequency in Z direction
- frequencydomainbodygyroscopeaveragex
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading in X direction
- frequencydomainbodygyroscopeaveragey
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading in Y direction
- frequencydomainbodygyroscopeaveragez
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading in Z direction
- frequencydomainbodygyroscopestandarddeviationx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in X direction
- frequencydomainbodygyroscopestandarddeviationy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in Y direction
- frequencydomainbodygyroscopestandarddeviationz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of gyroscopic movement reading in Z direction
- frequencydomainbodygyroscopeaveragefrequencyx
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading by frequency in X direction
- frequencydomainbodygyroscopeaveragefrequencyy
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading by frequency in Y direction
- frequencydomainbodygyroscopeaveragefrequencyz
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's average gyroscopic movement reading by frequency in Z direction
- frequencydomainbodyaccelerationmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of acceleration
- frequencydomainbodyaccelerationmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of acceleration
- frequencydomainbodyaccelerationmagnitudeaveragefrequency
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of acceleration by frequency
- frequencydomainbodyaccelerationjerkmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of jerk acceleration
- frequencydomainbodyaccelerationjerkmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of jerk acceleration
- frequencydomainbodyaccelerationjerkmagnitudeaveragefrequency
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of jerk acceleration by frequency
- frequencydomainbodygyroscopemagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic movement reading
- frequencydomainbodygyroscopemagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of gyroscopic movement reading
- frequencydomainbodygyroscopemagnitudeaveragefrequency
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic movement reading by frequency
- frequencydomainbodygyroscopejerkmagnitudeaverage
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic jerky movement reading
- frequencydomainbodygyroscopejerkmagnitudestandarddeviation
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's standard deviation of Eclidean norm magnitude of gyroscopic jerky movement reading
- frequencydomainbodygyroscopejerkmagnitudeaveragefrequency
Size: 12
Notation: Scientific
Type: Exponential Float
Frequency Domain measurement of smartphone wearer's body's Average of Eclidean norm magnitude of gyroscopic jerky movement reading by frequency