an><span class="op">(</span><span class="va">sleepstudy</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">ss1</span> <span class="op">&lt;-</span> <span class="va">sleepstudy</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Create weights</span></span></span>
<span class="r-in"><span><span class="va">ss1</span><span class="op">$</span><span class="va">W1</span> <span class="op">&lt;-</span> <span class="fu"><a href