Return a list of variable names being rejected for high
        correlation with one of remaining variables.

        Parameters:
        ----------
        threshold : float
            Correlation value which is above the threshold are rejected
        
        Returns
        -------
        list
            The list of rejected variables or an empty list if the correlation has not been computed.

def get_rejected_variables(self, threshold=0.9):
        """Return a list of variable names being rejected for high
        correlation with one of remaining variables.

        Parameters:
        ----------
        threshold : float
            Correlation value which is above the threshold are rejected
        
        Returns
        -------
        list
            The list of rejected variables or an empty list if the correlation has not been computed.
        """
        variable_profile = self.description_set['variables']
        result = []
        if hasattr(variable_profile, 'correlation'):
            result = variable_profile.index[variable_profile.correlation > threshold].tolist()
        return  result