public DoubleMomentStatistics combine(final DoubleMomentStatistics other) {
		super.combine(other);
		_min = Math.min(_min, other._min);
		_max = Math.max(_max, other._max);
		_sum.add(other._sum);

		return this;
	}
Combine two {@code DoubleMoments} statistic objects.

@param other the other {@code DoubleMoments} statistics to combine with
       {@code this} one.
@return {@code this} statistics object
@throws java.lang.NullPointerException if the other statistical summary
        is {@code null}.
jenetics/src/main/java/io/jenetics/stat/DoubleMomentStatistics.java