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<!DOCTYPE html>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="x-ua-compatible" content="IE=9" >
<title>Codebook for UCI HAR Dataset</title>
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<body>
<h1>Codebook for UCI HAR Dataset</h1>
<h3>This codebook is for the variables found in tidydata.txt created by run_analysis.R</h3>
<h3>This was preparred with the aid of README.txt and features_info.txt, which are files found in the folder “UCI HAR Dataset”, which appears in your working directory after running run_analysis.R.</h3>
<h3>Here is a link to the data set home page: <a href="http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones">Human Activity Recognition Using Smartphones Data Set</a></h3>
<p>SubjectID is a number between 1 and 30, each representing one of the thirty participants in the study. </p>
<p>ActivityID is one of the six different activites that were used to generate data:</p>
<ul>
<li>laying</li>
<li>sitting</li>
<li>standing</li>
<li>walking</li>
<li>walkingdownstairs (walking down stairs)</li>
<li>walkingupstairs (walking up stairs)</li>
</ul>
<p>The remaining 66 columns have descriptive variable names that follow the following naming conventions:</p>
<ul>
<li>a prefix “t” represents “time”</li>
<li>a prefix “f” represents “frequency domain signal”</li>
<li>a substring “BodyAcc” represents (estimated) body acceleration</li>
<li>a substring “GravityAcc” represents (total) gravity acceleration</li>
<li>a substring “Gyro” represents angular velocity measured by the gyroscope</li>
<li>a substring “Mag” represents magnitude</li>
<li>a substring “Jerk” represents the acceleration of the acceleration</li>
<li>a substring “Mean” represents that it is a mean</li>
<li>a substring “StdDev” represents that it is a standard deviation</li>
<li>a suffix “X”, “Y”, or “Z” represents motion in those respective directions<br/></li>
</ul>
<p>The original values of these variables were normalized and bounded within [-1,1]. After running run_analysis.R, the values that appear in tidydata.txt are: the mean of that variable given each combination of Subject and Activity. Note that the resulting values will still be within the interval [-1,1]. There are 30 subjects and 6 activiies, leading to 180 combinations of subject and activity. For each of those 180 combinations, all values of a given variable associated with the given combination where averaged. </p>
<p>For example, row 3 represents Subject 3 doing the activity Laying. Column 3 is “tBodyAccMeanX”. Then, the value in row 3, column 3 is then the mean of all the values of Subject 3's average body acceleration in the X direction while laying down.</p>
<table><thead>
<tr>
<th>Column Number</th>
<th align="left">Variable Name</th>
<th align="left">Description</th>
</tr>
</thead><tbody>
<tr>
<td>1</td>
<td align="left">SubjectID</td>
<td align="left">Subject ID</td>
</tr>
<tr>
<td>2</td>
<td align="left">ActivityID</td>
<td align="left">Activity ID</td>
</tr>
<tr>
<td>3</td>
<td align="left">tBodyAccMeanX</td>
<td align="left">Average body acceleration in X direction</td>
</tr>
<tr>
<td>4</td>
<td align="left">tBodyAccMeanY</td>
<td align="left">Average body acceleration in Y direction</td>
</tr>
<tr>
<td>5</td>
<td align="left">tBodyAccMeanZ</td>
<td align="left">Average body acceleration in Z direction</td>
</tr>
<tr>
<td>6</td>
<td align="left">tBodyAccStdDevX</td>
<td align="left">Standard deviation of body acceleration in X direction</td>
</tr>
<tr>
<td>7</td>
<td align="left">tBodyAccStdDevY</td>
<td align="left">Standard deviation of body acceleration in Y direction</td>
</tr>
<tr>
<td>8</td>
<td align="left">tBodyAccStdDevZ</td>
<td align="left">Standard deviation of body acceleration in Z direction</td>
</tr>
<tr>
<td>9</td>
<td align="left">tGravityAccMeanX</td>
<td align="left">Average gravity acceleration in X direction</td>
</tr>
<tr>
<td>10</td>
<td align="left">tGravityAccMeanY</td>
<td align="left">Average gravity acceleration in Y direction</td>
</tr>
<tr>
<td>11</td>
<td align="left">tGravityAccMeanZ</td>
<td align="left">Average gravity acceleration in Z direction</td>
</tr>
<tr>
<td>12</td>
<td align="left">tGravityAccStdDevX</td>
<td align="left">Standard deviation of gravity acceleration in X direction</td>
</tr>
<tr>
<td>13</td>
<td align="left">tGravityAccStdDevY</td>
<td align="left">Standard deviation of gravity acceleration in Y direction</td>
</tr>
<tr>
<td>14</td>
<td align="left">tGravityAccStdDevZ</td>
<td align="left">Standard deviation of gravity acceleration in Z direction</td>
</tr>
<tr>
<td>15</td>
<td align="left">tBodyAccJerkMeanX</td>
<td align="left">Average body jerk in X direction</td>
</tr>
<tr>
<td>16</td>
<td align="left">tBodyAccJerkMeanY</td>
<td align="left">Average body jerk in Y direction</td>
</tr>
<tr>
<td>17</td>
<td align="left">tBodyAccJerkMeanZ</td>
<td align="left">Average body jerk in Z direction</td>
</tr>
<tr>
<td>18</td>
<td align="left">tBodyAccJerkStdDevX</td>
<td align="left">Standard deviation of body jerk in X direction</td>
</tr>
<tr>
<td>19</td>
<td align="left">tBodyAccJerkStdDevY</td>
<td align="left">Standard deviation of body jerk in Y direction</td>
</tr>
<tr>
<td>20</td>
<td align="left">tBodyAccJerkStdDevZ</td>
<td align="left">Standard deviation of body jerk in Z direction</td>
</tr>
<tr>
<td>21</td>
<td align="left">tBodyGyroMeanX</td>
<td align="left">Average body rotation in X direction</td>
</tr>
<tr>
<td>22</td>
<td align="left">tBodyGyroMeanY</td>
<td align="left">Average body rotation in Y direction</td>
</tr>
<tr>
<td>23</td>
<td align="left">tBodyGyroMeanZ</td>
<td align="left">Average body rotation in Z direction</td>
</tr>
<tr>
<td>24</td>
<td align="left">tBodyGyroStdDevX</td>
<td align="left">Standard deviation of body rotation in X direction</td>
</tr>
<tr>
<td>25</td>
<td align="left">tBodyGyroStdDevY</td>
<td align="left">Standard deviation of body rotation in Y direction</td>
</tr>
<tr>
<td>26</td>
<td align="left">tBodyGyroStdDevZ</td>
<td align="left">Standard deviation of body rotation in Z direction</td>
</tr>
<tr>
<td>27</td>
<td align="left">tBodyGyroJerkMeanX</td>
<td align="left">Average body rotation jerk in X direction</td>
</tr>
<tr>
<td>28</td>
<td align="left">tBodyGyroJerkMeanY</td>
<td align="left">Average body rotation jerk in Y direction</td>
</tr>
<tr>
<td>29</td>
<td align="left">tBodyGyroJerkMeanZ</td>
<td align="left">Average body rotation jerk in Z direction</td>
</tr>
<tr>
<td>30</td>
<td align="left">tBodyGyroJerkStdDevX</td>
<td align="left">Standard deviation of body rotation jerk in X direction</td>
</tr>
<tr>
<td>31</td>
<td align="left">tBodyGyroJerkStdDevY</td>
<td align="left">Standard deviation of body rotation jerk in Y direction</td>
</tr>
<tr>
<td>32</td>
<td align="left">tBodyGyroJerkStdDevZ</td>
<td align="left">Standard deviation of body rotation jerk in Z direction</td>
</tr>
<tr>
<td>33</td>
<td align="left">tBodyAccMagMean</td>
<td align="left">Average magnitude of body acceleration</td>
</tr>
<tr>
<td>34</td>
<td align="left">tBodyAccMagStdDev</td>
<td align="left">Standard deviation of magnitude of body acceleration</td>
</tr>
<tr>
<td>35</td>
<td align="left">tGravityAccMagMean</td>
<td align="left">Average magnitude of gravity acceleration</td>
</tr>
<tr>
<td>36</td>
<td align="left">tGravityAccMagStdDev</td>
<td align="left">Standard deviation of magnitude of gravity acceleration</td>
</tr>
<tr>
<td>37</td>
<td align="left">tBodyAccJerkMagMean</td>
<td align="left">Average magnitude of body jerk</td>
</tr>
<tr>
<td>38</td>
<td align="left">tBodyAccJerkMagStdDev</td>
<td align="left">Standard deviatiion of magnitude of body jerk</td>
</tr>
<tr>
<td>39</td>
<td align="left">tBodyGyroMagMean</td>
<td align="left">Average magnitude of body rotation</td>
</tr>
<tr>
<td>40</td>
<td align="left">tBodyGyroMagStdDev</td>
<td align="left">Standard deviation of magnitude of body rotation</td>
</tr>
<tr>
<td>41</td>
<td align="left">tBodyGyroJerkMagMean</td>
<td align="left">Average magnitude of body rotation jerk</td>
</tr>
<tr>
<td>42</td>
<td align="left">tBodyGyroJerkMagStdDev</td>
<td align="left">Standard deviation of magnitude of body rotation jerk</td>
</tr>
<tr>
<td>43</td>
<td align="left">fBodyAccMeanX</td>
<td align="left">Average body acceleration in X direction</td>
</tr>
<tr>
<td>44</td>
<td align="left">fBodyAccMeanY</td>
<td align="left">Average body acceleration in Y direction</td>
</tr>
<tr>
<td>45</td>
<td align="left">fBodyAccMeanZ</td>
<td align="left">Average body acceleration in Z direction</td>
</tr>
<tr>
<td>46</td>
<td align="left">fBodyAccStdDevX</td>
<td align="left">Standard deviation of body acceleration in X direction</td>
</tr>
<tr>
<td>47</td>
<td align="left">fBodyAccStdDevY</td>
<td align="left">Standard deviation of body acceleration in Y direction</td>
</tr>
<tr>
<td>48</td>
<td align="left">fBodyAccStdDevZ</td>
<td align="left">Standard deviation of body acceleration in Z direction</td>
</tr>
<tr>
<td>49</td>
<td align="left">fBodyAccJerkMeanX</td>
<td align="left">Average body jerk in X direction</td>
</tr>
<tr>
<td>50</td>
<td align="left">fBodyAccJerkMeanY</td>
<td align="left">Average body jerk in Y direction</td>
</tr>
<tr>
<td>51</td>
<td align="left">fBodyAccJerkMeanZ</td>
<td align="left">Average body jerk in Z direction</td>
</tr>
<tr>
<td>52</td>
<td align="left">fBodyAccJerkStdDevX</td>
<td align="left">Standard deviation of body jerk in X direction</td>
</tr>
<tr>
<td>53</td>
<td align="left">fBodyAccJerkStdDevY</td>
<td align="left">Standard deviation of body jerk in Y direction</td>
</tr>
<tr>
<td>54</td>
<td align="left">fBodyAccJerkStdDevZ</td>
<td align="left">Standard deviation of body jerk in Z direction</td>
</tr>
<tr>
<td>55</td>
<td align="left">fBodyGyroMeanX</td>
<td align="left">Average body rotation in X direction</td>
</tr>
<tr>
<td>56</td>
<td align="left">fBodyGyroMeanY</td>
<td align="left">Average body rotation in Y direction</td>
</tr>
<tr>
<td>57</td>
<td align="left">fBodyGyroMeanZ</td>
<td align="left">Average body rotation in Z direction</td>
</tr>
<tr>
<td>58</td>
<td align="left">fBodyGyroStdDevX</td>
<td align="left">Standard deviation of body rotation in X direction</td>
</tr>
<tr>
<td>59</td>
<td align="left">fBodyGyroStdDevY</td>
<td align="left">Standard deviation of body rotation in Y direction</td>
</tr>
<tr>
<td>60</td>
<td align="left">fBodyGyroStdDevZ</td>
<td align="left">Standard deviation of body rotation in Z direction</td>
</tr>
<tr>
<td>61</td>
<td align="left">fBodyAccMagMean</td>
<td align="left">Average body rotation magnitude</td>
</tr>
<tr>
<td>62</td>
<td align="left">fBodyAccMagStdDev</td>
<td align="left">Standard deviation of body rotation magnitude</td>
</tr>
<tr>
<td>63</td>
<td align="left">fBodyBodyAccJerkMagMean</td>
<td align="left">Average magnitude of body jerk</td>
</tr>
<tr>
<td>64</td>
<td align="left">fBodyBodyAccJerkMagStdDev</td>
<td align="left">Standard deviation of magnitude of body jerk</td>
</tr>
<tr>
<td>65</td>
<td align="left">fBodyBodyGyroMagMean</td>
<td align="left">Average magnitude of body rotation</td>
</tr>
<tr>
<td>66</td>
<td align="left">fBodyBodyGyroMagStdDev</td>
<td align="left">Standard deviation of magnitude of body rotation</td>
</tr>
<tr>
<td>67</td>
<td align="left">fBodyBodyGyroJerkMagMean</td>
<td align="left">Average magnitude of body rotation jerk</td>
</tr>
<tr>
<td>68</td>
<td align="left">fBodyBodyGyroJerkMagStdDev</td>
<td align="left">Standard deviation of body rotation jerk</td>
</tr>
</tbody></table>
</body>
</html>