Bayesian information criterion (BIC) or Schwarz criterion
llf : float
value of the loglikelihood
nobs : int
number of observations
df_modelwc : int
number of parameters including constant
bic : float
information criterion
References
http://en.wikipedia.org/wiki/Bayesian_information_criterion
statsmodels.tools.eval_measures.aicc_sigma
statsmodels.tools.eval_measures.bic_sigma
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