Example usage for org.apache.commons.math3.stat.regression RegressionResults getRSquared

Introduction

In this page you can find the example usage for org.apache.commons.math3.stat.regression RegressionResults getRSquared.

Prototype

public double getRSquared() 

Source Link

Document

<p>Returns the <a href="http://www.xycoon.com/coefficient1.htm"> coefficient of multiple determination</a>, usually denoted r-square.</p> <p><strong>Preconditions</strong>: <ul> <li>At least numberOfParameters observations (with at least numberOfParameters different x values) must have been added before invoking this method.

Usage

From source file:IBDMUT.Tools.java

public static double[] ApacheRegression(double[][] x, double[] y) {
    if (x.length < 2) {
        //            Tools.warning("******************************************************");
        //            Tools.warning("******************************************************");
        //            Tools.warning("******************************************************");
        //            Tools.warning("Trying to run regression with " + x.length + " points.");
        //            Tools.warning("******************************************************");
        //            Tools.warning("******************************************************");
        //            Tools.warning("******************************************************");
        exit("Trying to run regression with " + x.length + " points.");
    }/*from  www . j  a  v  a 2 s . co  m*/
    if (Tools.loggerIsOn()) {
        Tools.writeLog("Regression");
        Tools.writeLog("\tx\ty");
        for (int i = 0; i < x.length; i++) {
            Tools.writeLog("\t" + x[i][0] + "\t" + y[i]);
        }
    }
    SimpleRegression reg = new SimpleRegression(true);
    reg.addObservations(x, y);
    RegressionResults regRes = reg.regress();
    double[] regResValues = regRes.getParameterEstimates();
    double intercept = regResValues[0];
    double slope = regResValues[1];
    return new double[] { intercept, slope, regRes.getRSquared() };
}

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