ceptable to have the
following declarations.</p>
<pre class="stan"><code>data {
 real lb;
}
parameters {
   real&lt;lower=lb&gt; phi;
}</code></pre>
<p>This declares a real-valued parameter <code>phi</code> to take values
greater than the value of the real-valued data variable <code>lb</code>.
Constraints may be complex expressions, but must be of type <code>int</code>
for integer variables and of type <code>real</code> for real variables
(including constraints on vectors, row vectors, and matrices).
Variab