PSI

package com.example;

public class PSI {
    public static void main(String args[]) {

        int averages[] = new int[] { 0, 0, 137, 128, 122, 131, 153, 198, 299, 371, 355, 312, 253, 268 };
        int readings[] = new int[averages.length];
        int diffs[] = new int[averages.length];

        double bestScore = Integer.MAX_VALUE;

        for (int i = 0; i < 300; i++) {
            readings[0] = i;
            for (int j = 0; j < 300; j++) {
                readings[1] = j;
                for (int k = 2; k < readings.length; k++) {
                    readings[k] = averages[k] * 3 - readings[k-1] - readings[k-2];
                }
                double sumsq = 0;
                for (int k = 1; k < readings.length; k++) {
                    diffs[k] = readings[k] - readings[k-1];
                }
                for (int k = 2; k < readings.length; k++) {
                    double diff = diffs[k] - diffs[k-1];
                    sumsq += Math.pow(Math.abs(diff), 2);
                }
                if (sumsq < bestScore) {
                    bestScore = sumsq;
                    System.out.println("New best score " + sumsq + " " + readings[0] + " : " + readings[1]);
                }
            }
        }

    }
}