 Although it is
specified in the <code>data</code> block, and thus must have a known value
before the program may be run, it is modeled as if it were generated
randomly as described by the model.</p>
<p>The variable <code>N</code> is a typical example of unmodeled data. It is
used to indicate a size that is not part of the model itself.</p>
<p>The other variables declared in the data and transformed data block are
examples of unmodeled parameters, also known as hyperparameters.
Unmodeled parameters are para