span>
<span class="r-in"><span>                            ds <span class="op">=</span> <span class="fl">.5</span>,</span></span>
<span class="r-in"><span>                            individual <span class="op">=</span> <span class="cn">TRUE</span>,</span></span>
<span class="r-in"><span>                            covs <span class="op">=</span> <span class="st">"x1"</span><span class="op">)</span></span></span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> `s_in = NULL`. I will use `s_in = 0` for 