tor (see Jeffreys (1961) and Kass and Raftery (1995)), to compare the models, where all the models are assumed a priori to be equally likely. This method is not chosen as the default method because the Bayes factor calculations can be quite unstable.</p>
<p>When method "WAIC" is used, the <code>winning_criteria</code> can be either a numeric value or a string expression. If numeric, it sets the threshold which the more complex model must exceed to be declared the more appropriate model. If a string, it must