dest.secondMoment = source.secondMoment.copy();
dest.n = source.n;
// Keep commons-math supplied statistics with embedded moments in synch
if (source.getVarianceImpl() instanceof Variance) {
dest.varianceImpl = new Variance(dest.secondMoment);
} else {
dest.varianceImpl = source.varianceImpl.copy();
}
if (source.meanImpl instanceof Mean) {
dest.meanImpl = new Mean(dest.secondMoment);