3-3"></a><span class="kw">set.seed</span>(<span class="dv">1234</span>) <span class="co"># for reproducibility </span></span>
<span id="cb23-4"><a href="Intro.html#cb23-4"></a></span>
<span id="cb23-5"><a href="Intro.html#cb23-5"></a>df &lt;-<span class="st"> </span><span class="kw">tibble</span>(<span class="st">&quot;a&quot;</span> =<span class="st"> </span><span class="kw">sample</span>(<span class="kw">c</span>(<span class="op">-</span><span class="dv">99</span>, <span class="dv">1</span><span class="op