Title: Why Bayesian Models Tests of Different Dimensionality Are Even Worse Than Null Hypothesis Significance Testing Authors: Timo von Oertzen, Angelika Stefan Abstract: In this presentation, we present some general maxims one may have when testing or analyzing parameters of a model. We review why the general idea of comparing a parameter space to a restricted version of itself with less dimensions (e.g., fixing a parameter to a point) is not a valid hypothesis. We specifically demonstrate in a simulation that Bayesian Model testing does not solve the problem but, in comparison to Null Hypothesis Significance Testing, even makes it worse.