'Tests Poisson family with canonical log link.'

@classmethod
def setup_class(cls):

    super(TestWtdGlmPoisson, cls).setup_class()
    cls.res1 = GLM(cls.endog, cls.exog, freq_weights=cls.weight, family=sm.families.Poisson()).fit()
    cls.res2 = GLM(cls.endog_big, cls.exog_big, family=sm.families.Poisson()).fit()
