Two Paired Sample T-Test
/*
July 2006. Annie Che <chea@stat.ucla.edu>. UCLA Statistics.
Source of example data:
Mathematical Statistics and Data Analysis, John Rice, Second Edition.
Page 412, example A, effect of cigarette smoking on platelet aggregation.
*/
package edu.ucla.stat.SOCR.analyses.example;
import java.util.HashMap;
import edu.ucla.stat.SOCR.analyses.data.Data;
import edu.ucla.stat.SOCR.analyses.result.TwoPairedTResult;
public class TwoPairedTExample {
public static void main(String args[]) {
double[] before = {25, 25, 27, 44, 30, 67, 53, 53, 52, 60, 28};
double[] after = {27, 29, 37, 56, 46, 82, 57, 80, 61, 59, 43};
// you'll need to instantiate a data instance first.
Data data = new Data();
// then use the following line to get the result.
try {
TwoPairedTResult result =
(TwoPairedTResult) data.modelTwoPairedT(before, after);
// modelTwoPairedT: order of first and second argumentd does NOT matter.
if (result != null) {
// Getting the model's parameter estiamtes and statistics.
double meanX = result.getMeanX();
double meanY = result.getMeanY();
// sum of variance of x and variance of y.
double sampleVar = result.getSampleVariance();
int degreesFreedome = result.getDF();
double tStat = result.getTStat();
String pValue = result.getPValue();
System.out.println("meanX = " + meanX);
System.out.println("meanY = " + meanY);
System.out.println("sampleVar = " + sampleVar);
System.out.println("degreesFreedome = " + degreesFreedome);
System.out.println("tStat = " + tStat);
System.out.println("pValue = " + pValue);
}
} catch (Exception e) {
System.out.println(e);
}
}
}
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