n><span class="op">(</span><span class="va">nt</span>, sd<span class="op">=</span><span class="va">tsd</span><span class="op">)</span><span class="op">[</span><span class="va">dat</span><span class="op">$</span><span class="va">t</span><span class="op">]</span></span></span>
<span class="r-in"><span>  <span class="va">dat</span><span class="op">$</span><span class="va">x</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/stats/Normal.html" class="external-link">rnorm</a></span>