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| <div class="subTitle">org.eclipse.jetty.util.statistic</div> |
| <h2 title="Class SampleStatistic" class="title">Class SampleStatistic</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <br> |
| <pre>public class <span class="typeNameLabel">SampleStatistic</span> |
| extends java.lang.Object</pre> |
| <div class="block">SampledStatistics |
| <p> |
| Provides max, total, mean, count, variance, and standard deviation of continuous sequence of samples. |
| <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 that |
| can be found by following <a href="http://www.jstor.org/pss/1266577">Note on a Method for Calculating Corrected Sums |
| of Squares and Products</a> |
| <p> |
| This algorithm is also described in Wikipedia at <a href= |
| "http://en.wikipedia.org/w/index.php?title=Algorithms_for_calculating_variance&section=4#On-line_algorithm"> |
| Algorithms for calculating variance </a></div> |
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| <td class="colFirst"><code>protected java.util.concurrent.atomic.AtomicLong</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#Z:Z_count">_count</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected java.util.concurrent.atomic.LongAccumulator</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#Z:Z_max">_max</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected java.util.concurrent.atomic.AtomicLong</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#Z:Z_total">_total</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>protected java.util.concurrent.atomic.LongAdder</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#Z:Z_totalVariance100">_totalVariance100</a></span></code> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getCount--">getCount</a></span>()</code> </td> |
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| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getMax--">getMax</a></span>()</code> </td> |
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| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getMean--">getMean</a></span>()</code> </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getStdDev--">getStdDev</a></span>()</code> </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getTotal--">getTotal</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#getVariance--">getVariance</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#reset--">reset</a></span>()</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#set-long-">set</a></span>(long sample)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/jetty/util/statistic/SampleStatistic.html#toString--">toString</a></span>()</code> </td> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li> |
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| <pre>protected final java.util.concurrent.atomic.LongAccumulator _max</pre> |
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| <pre>protected final java.util.concurrent.atomic.AtomicLong _total</pre> |
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| <pre>protected final java.util.concurrent.atomic.AtomicLong _count</pre> |
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| <pre>protected final java.util.concurrent.atomic.LongAdder _totalVariance100</pre> |
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| <dd>the max value</dd> |
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