def test_wrong_size_sigma_2d(self):
        n = len(self.endog)
        assert_raises(ValueError, GLS, self.endog, self.exog, sigma=np.ones((n-1,1-n)))

#    def check_confidenceintervals(self, conf1, conf2):
#        assert_almost_equal(conf1, conf2, DECIMAL_4)
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/regression/tests/test_regression.py/TestGLS_alt_sigma.test_wrong_size_sigma_2d/swapped operands of `-`