_normal.html">prm_log_normal</a></span><span class="op">(</span><span class="st">"wt"</span><span class="op">)</span> <span class="op">+</span></span></span>
<span class="r-in"><span>  <span class="fu">obs_additive</span><span class="op">(</span><span class="op">~</span><span class="va">wt</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># EMAX dose-response model with proportional RUV</span></span></span>
<span class="r-in"><spa