kw'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/stats/model.matrix.html'>model.matrix</a></span>(~<span class='no'>lpop</span>, <span class='kw'>data</span><span class='kw'>=</span><span class='no'>dta</span>)
<span class='no'>X</span> <span class='kw'>&lt;-</span> <span class='fu'>expf</span>(<span class='no'>X</span>, <span class='no'>X</span>[<span class='fl'>1</span>,])</div></pre>
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