public SDVariable[] normalizeMoments(String[] names, SDVariable counts, SDVariable means,
      SDVariable variances, double shift) {
    SDValidation.validateNumerical("normalizeMoments", "counts", counts);
    SDValidation.validateNumerical("normalizeMoments", "means", means);
    SDValidation.validateNumerical("normalizeMoments", "variances", variances);