ormation for proportions (same as <code>qnorm(x)</code>).</p></li>
<li><p><code>transf.iprobit</code>: inverse of the former (same as <code>pnorm(x)</code>).</p></li>
<li><p><code>transf.arcsin</code>: arcsine square root transformation for proportions.</p></li>
<li><p><code>transf.iarcsin</code>: inverse of the former.</p></li>
<li><p><code>transf.pft</code>: Freeman-Tukey (double arcsine) transformation for proportions. See Freeman and Tukey (1950). The <code>xi</code> argument is used to specify the prop