package com.imsl.test.example.stat;

import com.imsl.stat.*;

/**
 * <p>
 * Performs a chi-squared test for independence. </p>
 * <p>
 * The data in this example is taken from Kendall and Stuart (1979) and involves
 * a 2-way contingency table of distance vision graded from best to worst, between
 * the right and left eyes.  A test of independence is performed and a resulting 
 * \(p\)-value is displayed.  The small \(p\)-value is strong evidence that distance 
 * vision between the left and right eye is not independent.
 * </p>
 *
 * @see <a href="ContingencyTableEx1.java">Code</a>
 * @see <a href="doc-files/ContingencyTableEx1.out">Output</a>
 */

public class ContingencyTableEx1 {

    public static void main(String args[]) {
        double[][] table = {
            {821, 112, 85, 35},
            {116, 494, 145, 27},
            {72, 151, 583, 87},
            {43, 34, 106, 331}
        };
        ContingencyTable ct = new ContingencyTable(table);
        System.out.println("P-value = " + ct.getP());
    }
}