### Example 1: Random Number Generation

In this example, a discrete normal random sample of size 1000 is generated via `Random.nextGaussian`

. `Random.setSeed`

is first used to set the seed. After the `ChiSquaredTest`

constructor is called, the random observations are added to the test one at a time to simulate streaming data. The Chi-squared test is performed using `Cdf.normal`

as the cumulative distribution function object to see how well the random numbers fit the normal distribution.
import com.imsl.stat.*;
public class RandomEx1 implements CdfFunction {
public double cdf(double x) {
return Cdf.normal(x);
}
public static void main(String args[]) throws Exception {
int nObservations = 1000;
Random r = new Random(123457L);
ChiSquaredTest test = new ChiSquaredTest(new RandomEx1(), 10, 0);
for (int k = 0; k < nObservations; k++) {
test.update(r.nextNormal(), 1.0);
}
double p = test.getP();
System.out.println("The P-value is " + p);
}
}

#### Output

The P-value is 0.5518855965158241

Link to Java source.