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| <h2 title="Class OnlineSummarizer" class="title">Class OnlineSummarizer</h2> |
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| <pre>public class <span class="typeNameLabel">OnlineSummarizer</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Computes on-line estimates of mean, variance and all five quartiles (notably including the |
| median). Since this is done in a completely incremental fashion (that is what is meant by |
| on-line) estimates are available at any time and the amount of memory used is constant. Somewhat |
| surprisingly, the quantile estimates are about as good as you would get if you actually kept all |
| of the samples. |
| <p/> |
| The method used for mean and variance is Welford's method. See |
| <p/> |
| http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#On-line_algorithm |
| <p/> |
| The method used for computing the quartiles is a simplified form of the stochastic approximation |
| method described in the article "Incremental Quantile Estimation for Massive Tracking" by Chen, |
| Lambert and Pinheiro |
| <p/> |
| See |
| <p/> |
| http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.105.1580</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#OnlineSummarizer--">OnlineSummarizer</a></span>()</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#add-double-">add</a></span>(double sample)</code> </td> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#getCount--">getCount</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/apache/mahout/math/stats/OnlineSummarizer.html#getMax--">getMax</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/apache/mahout/math/stats/OnlineSummarizer.html#getMean--">getMean</a></span>()</code> </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#getMedian--">getMedian</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/apache/mahout/math/stats/OnlineSummarizer.html#getMin--">getMin</a></span>()</code> </td> |
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| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#getQuartile-int-">getQuartile</a></span>(int i)</code> </td> |
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| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#getSD--">getSD</a></span>()</code> </td> |
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| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/stats/OnlineSummarizer.html#quantile-double-">quantile</a></span>(double q)</code> </td> |
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| <pre>public OnlineSummarizer()</pre> |
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