lues in the Stan call and thus achieve exact replication if desired. (This can be useful for debugging.)</p>
<p>When running BUGS from R, you need to send exactly the data that the model needs. When running RStan, you can include extra data, which can be helpful when playing around with models. For example, if you remove a variable <code>x</code> from the model, you can keep it in the data sent from R, thus allowing you to quickly alter the Stan model without having to also change the calling information in