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<h2 title="Class Regression" class="title">Class Regression</h2>
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<pre>public abstract class <a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.55">Regression</a>
extends java.lang.Object</pre>
<div class="block">A utility class for fitting regression curves to data.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#Regression--">Regression</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#getOLSRegression-double:A:A-">getOLSRegression</a></span>(double[][]&nbsp;data)</code>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = a + bx, fitted to
 the data using ordinary least squares regression.</div>
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<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#getOLSRegression-org.jfree.data.xy.XYDataset-int-">getOLSRegression</a></span>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;data,
                int&nbsp;series)</code>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = a + bx, fitted to
 the data using ordinary least squares regression.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#getPolynomialRegression-org.jfree.data.xy.XYDataset-int-int-">getPolynomialRegression</a></span>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;dataset,
                       int&nbsp;series,
                       int&nbsp;order)</code>
<div class="block">Returns the parameters 'a0', 'a1', 'a2', ..., 'an' for a polynomial 
 function of order n, y = a0 + a1 * x + a2 * x^2 + ...</div>
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<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#getPowerRegression-double:A:A-">getPowerRegression</a></span>(double[][]&nbsp;data)</code>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = ax^b, fitted to
 the data using a power regression equation.</div>
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<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/data/statistics/Regression.html#getPowerRegression-org.jfree.data.xy.XYDataset-int-">getPowerRegression</a></span>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;data,
                  int&nbsp;series)</code>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = ax^b, fitted to
 the data using a power regression equation.</div>
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<h4>Regression</h4>
<pre>public&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.55">Regression</a>()</pre>
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<h4>getOLSRegression</h4>
<pre>public static&nbsp;double[]&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.66">getOLSRegression</a>(double[][]&nbsp;data)</pre>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = a + bx, fitted to
 the data using ordinary least squares regression.  The result is
 returned as a double[], where result[0] --&gt; a, and result[1] --&gt; b.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - the data.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parameters.</dd>
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<h4>getOLSRegression</h4>
<pre>public static&nbsp;double[]&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.110">getOLSRegression</a>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;data,
                                        int&nbsp;series)</pre>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = a + bx, fitted to
 the data using ordinary least squares regression. The result is returned
 as a double[], where result[0] --&gt; a, and result[1] --&gt; b.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - the data.</dd>
<dd><code>series</code> - the series (zero-based index).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parameters.</dd>
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<h4>getPowerRegression</h4>
<pre>public static&nbsp;double[]&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.153">getPowerRegression</a>(double[][]&nbsp;data)</pre>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = ax^b, fitted to
 the data using a power regression equation.  The result is returned as
 an array, where double[0] --&gt; a, and double[1] --&gt; b.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - the data.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parameters.</dd>
</dl>
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<h4>getPowerRegression</h4>
<pre>public static&nbsp;double[]&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.197">getPowerRegression</a>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;data,
                                          int&nbsp;series)</pre>
<div class="block">Returns the parameters 'a' and 'b' for an equation y = ax^b, fitted to
 the data using a power regression equation.  The result is returned as
 an array, where double[0] --&gt; a, and double[1] --&gt; b.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - the data.</dd>
<dd><code>series</code> - the series to fit the regression line against.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parameters.</dd>
</dl>
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<h4>getPolynomialRegression</h4>
<pre>public static&nbsp;double[]&nbsp;<a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.250">getPolynomialRegression</a>(<a href="../../../../org/jfree/data/xy/XYDataset.html" title="interface in org.jfree.data.xy">XYDataset</a>&nbsp;dataset,
                                               int&nbsp;series,
                                               int&nbsp;order)</pre>
<div class="block">Returns the parameters 'a0', 'a1', 'a2', ..., 'an' for a polynomial 
 function of order n, y = a0 + a1 * x + a2 * x^2 + ... + an * x^n,
 fitted to the data using a polynomial regression equation.
 The result is returned as an array with a length of n + 2,
 where double[0] --&gt; a0, double[1] --&gt; a1, .., double[n] --&gt; an.
 and double[n + 1] is the correlation coefficient R2
 Reference: J. D. Faires, R. L. Burden, Numerische Methoden (german
 edition), pp. 243ff and 327ff.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dataset</code> - the dataset (<code>null</code> not permitted).</dd>
<dd><code>series</code> - the series to fit the regression line against (the series
         must have at least order + 1 non-NaN items).</dd>
<dd><code>order</code> - the order of the function (&gt; 0).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parameters.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.0.14</dd>
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