PointStats.java
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A PointStats.java is a Java-based point estimation system.
- Context:
- It uses a Java Method.
- …
- Counter-Example(s):
- See: Sample Statistic, Standard Deviation, org.apache.commons.math.stat.descriptive.
References
2012
- Gabor Melli
/* PointStats.java (v1.0) - a Java-based class that calculates several point statistics. ** Return results as public variables. */ import java.util.Arrays; // includes .sort() public class PointStats { int n ; double sum=0, average, min, max, median, sumSq=0, sumSqDev=0, varS, stdDevS ; public PointStats(double[] values) { n = values.length; for (double val : values) {sum += val ;} average = sum / n; Arrays.sort(values); min = values [0]; max = values [values.length - 1]; int middle = n/2; if (n % 2 == 1) { // Odd number of elements -- return the middle one. median = values [middle]; } else { // Even number -- return average of middle two median = (values [middle - 1] + values [middle]) / 2.0; } for (double val : values) { sumSq += Math.pow(val, 2) ; sumSqDev += Math.pow(average - val, 2) ; } varS=sumSqDev/(n-1) ; stdDevS = Math.pow(varS, 0.5) ; } // include a main() method to illustrate it usage public static void main(String[] args) { double[] numList = new double [] { 2.0, 20.5, 24.5, 19.0 } ; PointStats inst = new PointStats(numList) ; System.out.printf("cnt=%d\tsum=%+2.2f\tavg=%2.2f\tmin=%2.2f\tmax=%2.2f\tmedian=%2.2f\tsumSq=%2.2f\tsumSqDev=%2.2f\tvarS=%2.2f\tstdDevS=%2.2f\n", inst.n, inst.sum, inst.average, inst.min, inst.max, inst.median, inst.sumSq, inst.sumSqDev, inst.varS, inst.stdDevS) ; } }