get the error variance of all three terms at a singluar value

        Parameters
        ----------
        singular_value : int
            singular value to test

        Returns
        -------
        dict : dict
            dictionary of (err var term,prediction_name), standard_deviation pairs

def variance_at(self, singular_value):
        """get the error variance of all three terms at a singluar value

        Parameters
        ----------
        singular_value : int
            singular value to test

        Returns
        -------
        dict : dict
            dictionary of (err var term,prediction_name), standard_deviation pairs

        """
        results = {}
        results.update(self.first_prediction(singular_value))
        results.update(self.second_prediction(singular_value))
        results.update(self.third_prediction(singular_value))
        return results