private final BaseUnits<Q> baseUnits;
        private final BigDecimal factor;

        public ScaledUnits(BaseUnits<Q> baseUnits, String displaySingular, String displayPlural, BigDecimal factor) {
            super(baseUnits.getType(), displaySingular, displayPlural);
            assert factor.compareTo(BigDecimal.ONE) > 0;
            this.baseUnits = baseUnits;
            this.factor = factor;

        this.min = min;
        this.max = max;

        BigDecimal sumSquares = BigDecimal.ZERO;
        Units<Q> baseUnits = average.getUnits().getBaseUnits();
        BigDecimal averageValue = average.toUnits(baseUnits).getValue();
        for (Amount<Q> amount : this) {
            BigDecimal diff = amount.toUnits(baseUnits).getValue();
            diff = diff.subtract(averageValue);
            diff = diff.multiply(diff);