commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/StandardDeviation.java [169:193]:
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    @Override
    public void accept(double value) {
        ss.accept(value);
    }

    /**
     * Gets the standard deviation of all input values.
     *
     * <p>When no values have been added, the result is {@code NaN}.
     *
     * @return standard deviation of all values.
     */
    @Override
    public double getAsDouble() {
        // This method checks the sum of squared is finite
        // to provide a consistent NaN when the computation is not possible.
        // Note: The SS checks for n=0 and returns NaN.
        final double m2 = ss.getSumOfSquaredDeviations();
        if (!Double.isFinite(m2)) {
            return Double.NaN;
        }
        final long n = ss.n;
        // Avoid a divide by zero
        if (n == 1) {
            return 0;
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/Variance.java [165:189]:
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    @Override
    public void accept(double value) {
        ss.accept(value);
    }

    /**
     * Gets the variance of all input values.
     *
     * <p>When no values have been added, the result is {@code NaN}.
     *
     * @return variance of all values.
     */
    @Override
    public double getAsDouble() {
        // This method checks the sum of squared is finite
        // to provide a consistent NaN when the computation is not possible.
        // Note: The SS checks for n=0 and returns NaN.
        final double m2 = ss.getSumOfSquaredDeviations();
        if (!Double.isFinite(m2)) {
            return Double.NaN;
        }
        final long n = ss.n;
        // Avoid a divide by zero
        if (n == 1) {
            return 0;
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