docs: private List<double[]> calculateMeanMeasurementsForParam(
              int numEntriesPerPreview,
              int numParamValues,
              int paramValue) 
      {
          List<double[]> paramMeasurementsSum  = 
                  new ArrayList<double[]>(numEntriesPerPreview);
          List<double[]> meanParamMeasurements = 
                  new ArrayList<double[]>(numEntriesPerPreview);
          
          int numCompleteFolds = 0;
          
          // sum up measurement values
          for (PreviewCollection<Preview> foldPreview : 
               this.origMultiRunPreviews.subPreviews) 
          {
              // check if there is a preview for each parameter value
              if (foldPreview.getPreviews().size() == numParamValues) {
                  numCompleteFolds++;
                  
                  Preview foldParamPreview = 
                          foldPreview.getPreviews().get(paramValue);
                  
                  // add this Preview's measurements to the overall sum
                  this.addPreviewMeasurementsToSum(
                          paramMeasurementsSum, 
                          foldParamPreview, 
                          numEntriesPerPreview);
              }
          }
          
          // divide sum by number of folds
          for (int entryIdx = 0; entryIdx < numEntriesPerPreview; entryIdx++) {
              double[] sumEntry  = paramMeasurementsSum.get(entryIdx);
              double[] meanEntry = new double[sumEntry.length];
              
              // first measurement is used for indexing -> simply copy
              meanEntry[0] = sumEntry[0];
              
              // calculate mean for remaining measurements
              for (int m = 1; m < sumEntry.length; m++) {
                  meanEntry[m] = sumEntry[m] / numCompleteFolds;
              }
              
              meanParamMeasurements.add(meanEntry);
          }
          
          return meanParamMeasurements;
      }