tic Variable Definitions</h3>
<p>The variables declared in the <code>data</code> and <code>parameters</code> block
are treated differently than other variables in that they are
automatically defined by the context in which they are used. This is
why there are no statements allowed in the data or parameters block.</p>
<p>The variables in the <code>data</code> block are read from an external input
source such as a file or a designated R data structure. The
variables in the <code>parameters</code> block are re