Return the estimated trait correlation coefficient matrix for term_i (or the total if term_i is None)
            To retrieve the trait covariance matrix use \see getTraitCovar

        Args:
            term_i:     index of the random effect term we want to retrieve the correlation coefficients
        Returns:
            estimated trait correlation coefficient matrix

def getTraitCorrCoef(self,term_i=None):
        """
        Return the estimated trait correlation coefficient matrix for term_i (or the total if term_i is None)
            To retrieve the trait covariance matrix use \see getTraitCovar

        Args:
            term_i:     index of the random effect term we want to retrieve the correlation coefficients
        Returns:
            estimated trait correlation coefficient matrix
        """
        cov = self.getTraitCovar(term_i)
        stds = sp.sqrt(cov.diagonal())[:,sp.newaxis]
        RV = cov / stds / stds.T
        return RV