ss16lab.outliers.Statistics.java Source code

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Here is the source code for ss16lab.outliers.Statistics.java

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/*
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package ss16lab.outliers;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang3.ArrayUtils;

/**
 * helper Class for mathematical methods
 *
 * @author Gj
 */
public class Statistics {

    double[] data;
    int size;

    public Statistics(double[] data) {
        this.data = data;
        size = data.length;
    }

    public double getMin() {
        List l = Arrays.asList(ArrayUtils.toObject(this.data));
        return (double) Collections.min(l);

    }

    public double getMax() {
        List l = Arrays.asList(ArrayUtils.toObject(this.data));
        return (double) Collections.max(l);
    }

    public double getMean() {
        double sum = 0.0;
        for (double a : data) {
            sum += a;
        }
        return sum / size;
    }

    public double getSum() {
        double sum = 0.0;
        for (double a : data) {
            sum += a;
        }
        return sum;
    }

    public double getVariance() {
        double mean = getMean();
        double temp = 0;
        for (double a : data) {
            temp += (a - mean) * (a - mean);
        }
        return temp / size;
    }

    public double getStdDev() {
        return Math.sqrt(getVariance());
    }

    public double median() {
        Arrays.sort(data);

        if (data.length % 2 == 0) {
            return (data[(data.length / 2) - 1] + data[data.length / 2]) / 2.0;
        } else {
            return data[data.length / 2];
        }
    }

    public static boolean contains(List<?> list, List<?> sublist) {
        if (list.size() == sublist.size()) {
            return false;
        }
        if (list.isEmpty() || sublist.isEmpty()) {
            return false;
        }
        return Collections.indexOfSubList(list, sublist) != -1;
    }
}