ee help('isSingular')</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> boundary (singular) fit: see help('isSingular')</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> boundary (singular) fit: see help('isSingular')</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> boundary (singular) fit: see help('isSingular')</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> boundary (singular) fit: see help('isSingular')</span>
<span class="r-in"><span></span></span>
<sp