public void setEvaluateStatistics (boolean _evaluateStatistics, BufferedWriter _buffer) {
		evaluateStatistics = _evaluateStatistics;
		if (evaluateStatistics) {
			statistics = new SkeletonStatistics(this);
			if (_buffer != null) {
				statistics.startStatisticsLogging(_buffer);
			}
		} else {
			if (statistics != null) {
				statistics.stopStatisticsLogging();
				statistics = null;
			}
		}
	}