st factor value is always omitted to prevent having a singular matrix
when adding a column of 1s (intercept) in models.</p>
    </div>

    <div id="ref-usage">
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">covar_from_df</span><span class="op">(</span><span class="va">df</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="arguments">
    <h2>Arguments</h2>
    <dl><dt>df</dt>
<dd><p>A data frame.</p></dd>

</dl></div>
    <div id="value">
 