i>
<li><p><code>order</code></p></li>
<li><p><code>group</code></p></li>
<li><p><code>label</code></p></li>
</ul><p><code>y</code> controls the heights of the alluvia,
and may be aggregated across equivalent observations.
<code>weight</code> applies to the computed variables (see that section below)
but does not affect the positional aesthetics.
<code>order</code>, recognized by <code>stat_alluvium()</code> and <code><a href="stat_flow.html">stat_flow()</a></code>, is used to
arrange the lodes within each s