'Tests Gamma family with log link.'

@classmethod
def setup_class(cls):

    super(TestWtdGlmGammaScale_X2, cls).setup_class()
    family_link = sm.families.Gamma(sm.families.links.log())
    cls.res1 = GLM(cls.endog, cls.exog, freq_weights=cls.weight, family=family_link, scale='X2').fit()
    cls.res2 = GLM(cls.endog_big, cls.exog_big, family=family_link, scale='X2').fit()
