tion formula <em></em>\(r_{pb} = \frac{d}{\sqrt{d^2 + h}}\), where <em></em>\(h = \frac{m}{n_1} + \frac{m}{n_2}\) and <em></em>\(m = n_1 + n_2 - 2\) (Jacobs &amp; Viechtbauer, 2017).</p></li>
<li><p><code>transf.dtorbis</code>: transformation of standardized mean differences to biserial correlations. Like <code>transf.dtorpb</code>, but the point-biserial correlations are then transformed to biserial correlations with <em></em>\(r_{bis} = \frac{\sqrt{p(1-p)}}{f(z_p)} r_{pb}\), where <em></em>\(p = \frac{n_1