docs: public double[] getVariances() {
  		double N = this.size();
      	double[] LS = new double[this.getNrOfDimensions()];
      	double[] SS = new double[this.getNrOfDimensions()];
  		double[] tmpFeatures;
  		double[] variances = new double[this.getNrOfDimensions()];
  
  		for (DataObject dataObject : dataList) {
  			tmpFeatures = dataObject.getFeatures();
  			for (int j = 0; j < tmpFeatures.length; j++) {
  				LS[j] += tmpFeatures[j];
  				SS[j] += tmpFeatures[j] * tmpFeatures[j];
  			}
  		}
  		
  		// sigmaSquared[i] = (SS[i] / N) - ((LS[i] * LS [i]) / (N * N));
  		for (int i = 0; i < LS.length; i++) {
  			variances[i] = (SS[i] / N - ((LS[i] / N)*(LS[i] / N)));
  		}
  		
  		return variances;
      }