commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/SumOfFourthDeviations.java [243:260]:
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        final double xbar = variance.computeMean();
        final double ss = variance.computeSumOfSquaredDeviations();
        // Unlike the double[] case, overflow/NaN is not possible:
        // (max value)^4 times max array length ~ (2^31)^4 * 2^31 ~ 2^155.
        // Compute sum of cubed and fourth deviations together.
        double sc = 0;
        double sq = 0;
        for (int i = from; i < to; i++) {
            final double x = values[i] - xbar;
            final double x2 = x * x;
            sc += x2 * x;
            sq += x2 * x2;
        }
        // Edge case to avoid floating-point error for zero
        if (to - from <= LENGTH_TWO) {
            sc = 0;
        }
        return new SumOfFourthDeviations(sq, sc, ss, xbar, to - from);
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/SumOfFourthDeviations.java [295:312]:
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        final double xbar = variance.computeMean();
        final double ss = variance.computeSumOfSquaredDeviations();
        // Unlike the double[] case, overflow/NaN is not possible:
        // (max value)^4 times max array length ~ (2^31)^4 * 2^31 ~ 2^155.
        // Compute sum of cubed and fourth deviations together.
        double sc = 0;
        double sq = 0;
        for (int i = from; i < to; i++) {
            final double x = values[i] - xbar;
            final double x2 = x * x;
            sc += x2 * x;
            sq += x2 * x2;
        }
        // Edge case to avoid floating-point error for zero
        if (to - from <= LENGTH_TWO) {
            sc = 0;
        }
        return new SumOfFourthDeviations(sq, sc, ss, xbar, to - from);
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