public static double getStandardDeviation(List<Integer> values) {
		double deviation = 0.0;
		if ((values != null) && (values.size() > 1)) {
			double mean = getAverageFPS();
			for (int value : values) {
				double delta = value-mean;
				deviation += delta*delta;
			}
			deviation = Math.sqrt(deviation/values.size());
		}
		return deviation;
	}