p">=</span> <span class="va">split_data</span><span class="op">$</span><span class="va">train</span><span class="op">)</span></span></span>
<span class="r-err co"><span class="r-pr">#&gt;</span> <span class="error">Error in as.data.frame(unclass(data), stringsAsFactors = TRUE):</span> object 'split_data' not found</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">model</span> <span class="op">&lt;-</span></span></span>
<span class="r-in"><span>  <span class="fu"><a