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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.eclipse.jetty.util.statistic</a></div> |
| <h2 title="Class SampleStatistic" class="title">Class SampleStatistic</h2> |
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| <li>java.lang.Object</li> |
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| <pre>public class <span class="typeNameLabel">SampleStatistic</span> |
| extends java.lang.Object</pre> |
| <div class="block"><p>Statistics on a sampled value.</p> |
| <p>Provides max, total, mean, count, variance, and standard deviation of continuous sequence of samples.</p> |
| <p>Calculates estimates of mean, variance, and standard deviation characteristics of a sample using a non synchronized |
| approximation of the on-line algorithm presented in <cite>Donald Knuth's Art of Computer Programming, Volume 2, |
| Semi numerical Algorithms, 3rd edition, page 232, Boston: Addison-Wesley</cite>. That cites a 1962 paper by B.P. Welford: |
| <a href="http://www.jstor.org/pss/1266577">Note on a Method for Calculating Corrected Sums of Squares and Products</a></p> |
| <p>This algorithm is also described in Wikipedia in the section "Online algorithm": |
| <a href="https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance">Algorithms for calculating variance</a>.</p></div> |
| </li> |
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| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
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| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">SampleStatistic</a></span>()</code></th> |
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| <td class="colFirst"><code>long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCount()">getCount</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMax()">getMax</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMean()">getMean</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStdDev()">getStdDev</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotal()">getTotal</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVariance()">getVariance</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#record(long)">record</a></span>​(long sample)</code></th> |
| <td class="colLast"> |
| <div class="block">Records a sample value.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#reset()">reset</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Resets the statistics.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
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| <h4>SampleStatistic</h4> |
| <pre>public SampleStatistic()</pre> |
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| <h4>reset</h4> |
| <pre class="methodSignature">public void reset()</pre> |
| <div class="block">Resets the statistics.</div> |
| </li> |
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| <h4>record</h4> |
| <pre class="methodSignature">public void record​(long sample)</pre> |
| <div class="block">Records a sample value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sample</code> - the value to record.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getMax()"> |
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| </a> |
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| <li class="blockList"> |
| <h4>getMax</h4> |
| <pre class="methodSignature">public long getMax()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the max value of the recorded samples</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getTotal()"> |
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| </a> |
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| <h4>getTotal</h4> |
| <pre class="methodSignature">public long getTotal()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the sum of all the recorded samples</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getCount()"> |
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| </a> |
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| <h4>getCount</h4> |
| <pre class="methodSignature">public long getCount()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of samples recorded</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getMean()"> |
| <!-- --> |
| </a> |
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| <h4>getMean</h4> |
| <pre class="methodSignature">public double getMean()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the average value of the samples recorded, or zero if there are no samples</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getVariance()"> |
| <!-- --> |
| </a> |
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| <h4>getVariance</h4> |
| <pre class="methodSignature">public double getVariance()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the variance of the samples recorded, or zero if there are less than 2 samples</dd> |
| </dl> |
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| <h4>getStdDev</h4> |
| <pre class="methodSignature">public double getStdDev()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the standard deviation of the samples recorded</dd> |
| </dl> |
| </li> |
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| <h4>toString</h4> |
| <pre class="methodSignature">public java.lang.String toString()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>toString</code> in class <code>java.lang.Object</code></dd> |
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