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<h3 class="unnumbered anchored" data-anchor-id="data-vs.-parameters">Data vs.&nbsp;parameters</h3>
<p>The arguments for the real data <code>x_r</code> and the integer data <code>x_i</code> must be expressions that only involve data or transformed data variables. <code>theta</code>, on the other hand, can be a function of data, transformed data, parameters, or transformed parameters.</p>
<p>The endpoints of integration can be data or parameters (and internally the derivatives of the integral 