is calculate the change in the average tax rates for each percentile.
This function accepts a sample file and a baseline sample file, and returns a 100-row table
giving the mean change in average tax rates for each percentile, compared to the baseline.</p>
    </div>

    <pre class="usage"><span class='fu'>compare_avg_tax_rates</span>(<span class='no'>DT</span>, <span class='no'>baseDT</span>, <span class='kw'>by</span> <span class='kw'>=</span> <span class='st'>"id"</span>, <span class='kw'>ids</span> <sp