code: protected double getOldCentroidScore(DoubleVector vector,
                                           int oldCentroidIndex,
                                           int altClusterSize) {
          return subtractedMagnitudeSqrd(centroids[oldCentroidIndex], vector) / 
                 altClusterSize;
         // Math.pow(altCurrentCentroid.magnitude(), 2) / altClusterSize;
      }
docs: {@inheritDoc}