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| <li>Summary: </li> |
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| <div class="subTitle">org.apache.openejb.math.stat.descriptive.moment</div> |
| <h2 title="Class Mean" class="title">Class Mean</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">org.apache.openejb.math.stat.descriptive.AbstractUnivariateStatistic</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">org.apache.openejb.math.stat.descriptive.AbstractStorelessUnivariateStatistic</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.openejb.math.stat.descriptive.moment.Mean</li> |
| </ul> |
| </li> |
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| </li> |
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| </ul> |
| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">UnivariateStatistic</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html" title="interface in org.apache.openejb.math.stat.descriptive">WeightedEvaluation</a></dd> |
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| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">Mean</span> |
| extends <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a> |
| implements java.io.Serializable, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html" title="interface in org.apache.openejb.math.stat.descriptive">WeightedEvaluation</a></pre> |
| <div class="block"><p>Computes the arithmetic mean of a set of values. Uses the definitional |
| formula:</p> |
| <p> |
| mean = sum(x_i) / n |
| </p> |
| <p>where <code>n</code> is the number of observations. |
| </p> |
| <p>When <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#increment-double-"><code>increment(double)</code></a> is used to add data incrementally from a |
| stream of (unstored) values, the value of the statistic that |
| <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#getResult--"><code>getResult()</code></a> returns is computed using the following recursive |
| updating algorithm: </p> |
| <ol> |
| <li>Initialize <code>m = </code> the first value</li> |
| <li>For each additional value, update using <br> |
| <code>m = m + (new value - m) / (number of observations)</code></li> |
| </ol> |
| <p> If <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#evaluate-double:A-"><code>AbstractStorelessUnivariateStatistic.evaluate(double[])</code></a> is used to compute the mean of an array |
| of stored values, a two-pass, corrected algorithm is used, starting with |
| the definitional formula computed using the array of stored values and then |
| correcting this by adding the mean deviation of the data values from the |
| arithmetic mean. See, e.g. "Comparison of Several Algorithms for Computing |
| Sample Means and Variances," Robert F. Ling, Journal of the American |
| Statistical Association, Vol. 69, No. 348 (Dec., 1974), pp. 859-866. </p> |
| <p> |
| Returns <code>Double.NaN</code> if the dataset is empty. |
| </p> |
| <strong>Note that this implementation is not synchronized.</strong> If |
| multiple threads access an instance of this class concurrently, and at least |
| one of the threads invokes the <code>increment()</code> or |
| <code>clear()</code> method, it must be synchronized externally.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../serialized-form.html#org.apache.openejb.math.stat.descriptive.moment.Mean">Serialized Form</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <!-- =========== FIELD SUMMARY =========== --> |
| <ul class="blockList"> |
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| <!-- --> |
| </a> |
| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#incMoment">incMoment</a></span></code> |
| <div class="block">Determines whether or not this statistic can be incremented or cleared.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/FirstMoment.html" title="class in org.apache.openejb.math.stat.descriptive.moment">FirstMoment</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#moment">moment</a></span></code> |
| <div class="block">First moment on which this statistic is based.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.summary"> |
| <!-- --> |
| </a> |
| <h3>Constructor Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#Mean--">Mean</a></span>()</code> |
| <div class="block">Constructs a Mean.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#Mean-org.apache.openejb.math.stat.descriptive.moment.FirstMoment-">Mean</a></span>(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/FirstMoment.html" title="class in org.apache.openejb.math.stat.descriptive.moment">FirstMoment</a> m1)</code> |
| <div class="block">Constructs a Mean with an External Moment.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#Mean-org.apache.openejb.math.stat.descriptive.moment.Mean-">Mean</a></span>(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> original)</code> |
| <div class="block">Copy constructor, creates a new <code>Mean</code> identical |
| to the <code>original</code></div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#clear--">clear</a></span>()</code> |
| <div class="block">Clears the internal state of the Statistic</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#copy--">copy</a></span>()</code> |
| <div class="block">Returns a copy of the statistic with the same internal state.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#copy-org.apache.openejb.math.stat.descriptive.moment.Mean-org.apache.openejb.math.stat.descriptive.moment.Mean-">copy</a></span>(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> source, |
| <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> dest)</code> |
| <div class="block">Copies source to dest.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#evaluate-double:A-double:A-">evaluate</a></span>(double[] values, |
| double[] weights)</code> |
| <div class="block">Returns the weighted arithmetic mean of the entries in the input array.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#evaluate-double:A-double:A-int-int-">evaluate</a></span>(double[] values, |
| double[] weights, |
| int begin, |
| int length)</code> |
| <div class="block">Returns the weighted arithmetic mean of the entries in the specified portion of |
| the input array, or <code>Double.NaN</code> if the designated subarray |
| is empty.</div> |
| </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/openejb/math/stat/descriptive/moment/Mean.html#evaluate-double:A-int-int-">evaluate</a></span>(double[] values, |
| int begin, |
| int length)</code> |
| <div class="block">Returns the arithmetic mean of the entries in the specified portion of |
| the input array, or <code>Double.NaN</code> if the designated subarray |
| is empty.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#getN--">getN</a></span>()</code> |
| <div class="block">Returns the number of values that have been added.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#getResult--">getResult</a></span>()</code> |
| <div class="block">Returns the current value of the Statistic.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html#increment-double-">increment</a></span>(double d)</code> |
| <div class="block">Updates the internal state of the statistic to reflect the addition of the new value.</div> |
| </td> |
| </tr> |
| </table> |
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| </a> |
| <h3>Methods inherited from class org.apache.openejb.math.stat.descriptive.<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></h3> |
| <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#equals-java.lang.Object-">equals</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#evaluate-double:A-">evaluate</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#hashCode--">hashCode</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#incrementAll-double:A-">incrementAll</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#incrementAll-double:A-int-int-">incrementAll</a></code></li> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.openejb.math.stat.descriptive.AbstractUnivariateStatistic"> |
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| </a> |
| <h3>Methods inherited from class org.apache.openejb.math.stat.descriptive.<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractUnivariateStatistic</a></h3> |
| <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractUnivariateStatistic.html#test-double:A-double:A-int-int-">test</a>, <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractUnivariateStatistic.html#test-double:A-int-int-">test</a></code></li> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="moment"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>moment</h4> |
| <pre>protected <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/FirstMoment.html" title="class in org.apache.openejb.math.stat.descriptive.moment">FirstMoment</a> moment</pre> |
| <div class="block">First moment on which this statistic is based.</div> |
| </li> |
| </ul> |
| <a name="incMoment"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>incMoment</h4> |
| <pre>protected boolean incMoment</pre> |
| <div class="block">Determines whether or not this statistic can be incremented or cleared. |
| <p> |
| Statistics based on (constructed from) external moments cannot |
| be incremented or cleared.</p></div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="Mean--"> |
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| </a> |
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| <h4>Mean</h4> |
| <pre>public Mean()</pre> |
| <div class="block">Constructs a Mean.</div> |
| </li> |
| </ul> |
| <a name="Mean-org.apache.openejb.math.stat.descriptive.moment.FirstMoment-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>Mean</h4> |
| <pre>public Mean(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/FirstMoment.html" title="class in org.apache.openejb.math.stat.descriptive.moment">FirstMoment</a> m1)</pre> |
| <div class="block">Constructs a Mean with an External Moment.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>m1</code> - the moment</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="Mean-org.apache.openejb.math.stat.descriptive.moment.Mean-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>Mean</h4> |
| <pre>public Mean(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> original)</pre> |
| <div class="block">Copy constructor, creates a new <code>Mean</code> identical |
| to the <code>original</code></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>original</code> - the <code>Mean</code> instance to copy</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="increment-double-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>increment</h4> |
| <pre>public void increment(double d)</pre> |
| <div class="block">Updates the internal state of the statistic to reflect the addition of the new value.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html#increment-double-">increment</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#increment-double-">increment</a></code> in class <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>d</code> - the new value.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="clear--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>clear</h4> |
| <pre>public void clear()</pre> |
| <div class="block">Clears the internal state of the Statistic</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html#clear--">clear</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#clear--">clear</a></code> in class <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getResult--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getResult</h4> |
| <pre>public double getResult()</pre> |
| <div class="block">Returns the current value of the Statistic.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html#getResult--">getResult</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#getResult--">getResult</a></code> in class <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>value of the statistic, <code>Double.NaN</code> if it |
| has been cleared or just instantiated.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getN--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getN</h4> |
| <pre>public long getN()</pre> |
| <div class="block">Returns the number of values that have been added.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html#getN--">getN</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of values.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="evaluate-double:A-int-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>evaluate</h4> |
| <pre>public double evaluate(double[] values, |
| int begin, |
| int length)</pre> |
| <div class="block">Returns the arithmetic mean of the entries in the specified portion of |
| the input array, or <code>Double.NaN</code> if the designated subarray |
| is empty. |
| <p> |
| Throws <code>IllegalArgumentException</code> if the array is null.</p> |
| <p> |
| See <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment"><code>Mean</code></a> for details on the computing algorithm.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html#evaluate-double:A-int-int-">evaluate</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">UnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#evaluate-double:A-int-int-">evaluate</a></code> in class <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - the input array</dd> |
| <dd><code>begin</code> - index of the first array element to include</dd> |
| <dd><code>length</code> - the number of elements to include</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the mean of the values or Double.NaN if length = 0</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the array is null or the array index |
| parameters are not valid</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html#evaluate-double:A-int-int-"><code>UnivariateStatistic.evaluate(double[], int, int)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="evaluate-double:A-double:A-int-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>evaluate</h4> |
| <pre>public double evaluate(double[] values, |
| double[] weights, |
| int begin, |
| int length)</pre> |
| <div class="block">Returns the weighted arithmetic mean of the entries in the specified portion of |
| the input array, or <code>Double.NaN</code> if the designated subarray |
| is empty. |
| <p> |
| Throws <code>IllegalArgumentException</code> if either array is null.</p> |
| <p> |
| See <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment"><code>Mean</code></a> for details on the computing algorithm. The two-pass algorithm |
| described above is used here, with weights applied in computing both the original |
| estimate and the correction factor.</p> |
| <p> |
| Throws <code>IllegalArgumentException</code> if any of the following are true: |
| <ul><li>the values array is null</li> |
| <li>the weights array is null</li> |
| <li>the weights array does not have the same length as the values array</li> |
| <li>the weights array contains one or more infinite values</li> |
| <li>the weights array contains one or more NaN values</li> |
| <li>the weights array contains negative values</li> |
| <li>the start and length arguments do not determine a valid array</li> |
| </ul></p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html#evaluate-double:A-double:A-int-int-">evaluate</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html" title="interface in org.apache.openejb.math.stat.descriptive">WeightedEvaluation</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - the input array</dd> |
| <dd><code>weights</code> - the weights array</dd> |
| <dd><code>begin</code> - index of the first array element to include</dd> |
| <dd><code>length</code> - the number of elements to include</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the mean of the values or Double.NaN if length = 0</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the parameters are not valid</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.1</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="evaluate-double:A-double:A-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>evaluate</h4> |
| <pre>public double evaluate(double[] values, |
| double[] weights)</pre> |
| <div class="block">Returns the weighted arithmetic mean of the entries in the input array. |
| <p> |
| Throws <code>IllegalArgumentException</code> if either array is null.</p> |
| <p> |
| See <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment"><code>Mean</code></a> for details on the computing algorithm. The two-pass algorithm |
| described above is used here, with weights applied in computing both the original |
| estimate and the correction factor.</p> |
| <p> |
| Throws <code>IllegalArgumentException</code> if any of the following are true: |
| <ul><li>the values array is null</li> |
| <li>the weights array is null</li> |
| <li>the weights array does not have the same length as the values array</li> |
| <li>the weights array contains one or more infinite values</li> |
| <li>the weights array contains one or more NaN values</li> |
| <li>the weights array contains negative values</li> |
| </ul></p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html#evaluate-double:A-double:A-">evaluate</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/WeightedEvaluation.html" title="interface in org.apache.openejb.math.stat.descriptive">WeightedEvaluation</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - the input array</dd> |
| <dd><code>weights</code> - the weights array</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the mean of the values or Double.NaN if length = 0</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the parameters are not valid</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.1</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="copy--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>copy</h4> |
| <pre>public <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> copy()</pre> |
| <div class="block">Returns a copy of the statistic with the same internal state.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html#copy--">copy</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/StorelessUnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">StorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html#copy--">copy</a></code> in interface <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/UnivariateStatistic.html" title="interface in org.apache.openejb.math.stat.descriptive">UnivariateStatistic</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html#copy--">copy</a></code> in class <code><a href="../../../../../../../org/apache/openejb/math/stat/descriptive/AbstractStorelessUnivariateStatistic.html" title="class in org.apache.openejb.math.stat.descriptive">AbstractStorelessUnivariateStatistic</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a copy of the statistic</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="copy-org.apache.openejb.math.stat.descriptive.moment.Mean-org.apache.openejb.math.stat.descriptive.moment.Mean-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>copy</h4> |
| <pre>public static void copy(<a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> source, |
| <a href="../../../../../../../org/apache/openejb/math/stat/descriptive/moment/Mean.html" title="class in org.apache.openejb.math.stat.descriptive.moment">Mean</a> dest)</pre> |
| <div class="block">Copies source to dest. |
| <p>Neither source nor dest can be null.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - Mean to copy</dd> |
| <dd><code>dest</code> - Mean to copy to</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.NullPointerException</code> - if either source or dest is null</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
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