class FatStats extends AbstractStats {

    public FatStats add(FatStats stats) {
        // TODO pull up, but I don't know how to implement the same for SlimStats now, have a look here?
        // http://stats.stackexchange.com/questions/25848/how-to-sum-a-standard-deviation
        Validate.notNull(stats, "stats must not be null");
        values.addAll(stats.values);
        sorted = false;
        return this;
    }

    public  FatStats();
    public  FatStats(Collection<? extends Number> values);
    public  FatStats(int size);

}