/** Used for combining weighted predictions. */
 public RegressionStatBinaryNomiss normalizedCopy() {
   RegressionStatBinaryNomiss copy = (RegressionStatBinaryNomiss) cloneSimple();
   copy.m_NbExamples = 0;
   copy.m_SumWeight = 1;
   calcMean(copy.m_Means);
   return copy;
 }