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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> </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[][] 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>
- </td>
- </tr>
- <tr id="i1" class="rowColor">
- <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> data,
- int 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>
- </td>
- </tr>
- <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> dataset,
- int series,
- int 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>
- </td>
- </tr>
- <tr id="i3" class="rowColor">
- <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[][] 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>
- </td>
- </tr>
- <tr id="i4" 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#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> data,
- int 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>
- </td>
- </tr>
- </table>
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- <h4>Regression</h4>
- <pre>public <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 double[] <a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.66">getOLSRegression</a>(double[][] 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] --> a, and result[1] --> 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>
- </li>
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- <h4>getOLSRegression</h4>
- <pre>public static double[] <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> data,
- int 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] --> a, and result[1] --> 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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- <pre>public static double[] <a href="../../../../src-html/org/jfree/data/statistics/Regression.html#line.153">getPowerRegression</a>(double[][] 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] --> a, and double[1] --> 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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- <pre>public static double[] <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> data,
- int 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] --> a, and double[1] --> 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>
- </li>
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- <h4>getPolynomialRegression</h4>
- <pre>public static double[] <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> dataset,
- int series,
- int 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] --> a0, double[1] --> a1, .., double[n] --> 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 (> 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>
- </dl>
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