r <code>phases = c(2,4)</code>
for comparing the second to the fourth phase. Phases could be combined by
providing a list with two elements. E.g., <code>phases = list(A = c(1,3), B = c(2,4))</code> will compare phases 1 and 3 (as A) against 2 and 4 (as B). Default
is <code>phases = c(1,2)</code>.</p></dd>


<dt id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
<dd><p>Additional arguments for the <code>FUN</code> parameter (e.g.
<code>FUN = mean, trim = 0.1</code> will use the 10 pe