ss="dv">1</span><span class="sc">:</span>p)</span>
<span id="cb6-7"><a href="#cb6-7" aria-hidden="true" tabindex="-1"></a>Xadd <span class="ot">&lt;-</span> <span class="fu">matrix</span>(<span class="fu">rnorm</span>(<span class="dv">5</span> <span class="sc">*</span> n), n, <span class="dv">5</span>)  <span class="co"># additional variables</span></span>
<span id="cb6-8"><a href="#cb6-8" aria-hidden="true" tabindex="-1"></a><span class="fu">colnames</span>(Xadd) <span class="ot">&lt;-</span> <span class="