Standard Deviation - Java Algorithm

Java examples for Algorithm:Statistics

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Description

Standard Deviation

Demo Code



public class StdDeviation {
    public static void main(String args[]) {
        double n[] = new double[5];
        for (int i = 0; i < n.length; i++) {
            n[i] = Math.random();
        }//from w  w w  .j  a  v a 2s . c  o m
        for (int i = 0; i < n.length; i++) {
            //System.out.println(n[i]);
        }
        double min = Integer.MAX_VALUE;
        double max = Integer.MIN_VALUE;
        for (int i = 0; i < n.length; i++) {
            if (n[i] < min) {
                min = n[i];
            }
            if (n[i] > max) {
                max = n[i];
            }
        }

        double sum = 0;
        for (int i = 0; i < n.length; i++) {
            sum = sum + n[i];
        }
        double avg = sum / n.length;
        System.out.println("avg" + avg);

        double y[] = new double[n.length];
        for (int i = 0; i < n.length; i++) {
            y[i] = Math.pow(avg - n[i], 2);
        }
        double s = 0;
        for (int i = 0; i < y.length; i++) {
            s = s + y[i];
        }
        System.out.println(s);
        double av = s / y.length;
        System.out.println(Math.sqrt(av));
    }

}

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