o/r/base/matrix.html" class="external-link">matrix</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/Normal.html" class="external-link">rnorm</a></span><span class="op">(</span><span class="fl">1000</span><span class="op">)</span>,ncol<span class="op">=</span><span class="fl">10</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="co">## combine first column of responses with predictor variables</span></span></span>
<span class="r-in"><span><