Akaike information criterion (AIC) with small sample correction
llf : float
value of the loglikelihood
nobs : int
number of observations
df_modelwc : int
number of parameters including constant
aicc : float
information criterion
References
http://en.wikipedia.org/wiki/Akaike_information_criterion#AICc
statsmodels.tools.eval_measures.aic_sigma
statsmodels.tools.eval_measures.aicc_sigma
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