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<p>Although parameters in Stan models may have improper priors, we do not want improper <em>posterior</em> distributions, as we are trying to use these distributions for Bayesian inference. There is no general way to check if a posterior distribution is improper. But if all the priors are proper, the posterior will be proper also.</p>
<p>Each statement in a Stan model is directly translated into the C++ code for computing the log posterior