code: public final double squareSum(final AbstractMeter meter) {
          checkIfMeterExists(meter);
          final AbstractUnivariateStatistic sqrSum = new SumOfSquares();
          final CollectionDoubleCollection doubleColl = new CollectionDoubleCollection(this.meterResults.get(meter));
          return sqrSum.evaluate(doubleColl.toArray(), 0, doubleColl.toArray().length);
      }
docs: Computes the square sum of the elements.
  
  @param meter the meter of the mean
  @return the square sum.