Özet:

Copulas are functions that reveal the dependence between random variables, have uniform distribution on univariate margins [0,1] and link multivariate distributions to their univariate margins. When establishing the dependency structure with Copula, different models should be established and the appropriate one among them should be preferred. There are different criteria used to make this choice. Among these criteria, the most preferred AIC value may lead to the selection of incorrect Copula model at different observation numbers and different correlation levels. In order to understand this problem better, model choices made in different combinations according to the AIC value were examined. Inappropriate selections in the models are discussed in detail. In addition, the predisposition to select incorrect Copula families has been revealed.