docs: def getEstTraitCorrCoef(self,term_i=None):
          """
          Returns the estimated trait correlation matrix
  
          Args:
              term_i:     index of the term we are interested in
          """
          cov = self.getEstTraitCovar(term_i)
          stds=SP.sqrt(cov.diagonal())[:,SP.newaxis]
          RV = cov/stds/stds.T
          return RV