p; \mbox{if } 1 &lt; i &lt; j.
\end{array}
\right.
\]</span></p>
<p>The final stage of the transform reverses the hyperbolic tangent
transform, which is defined by</p>
<p><span class="math display">\[
\tanh^{-1} v = \frac{1}{2} \log \left( \frac{1 + v}{1 - v} \right).
\]</span></p>
<p>The inverse hyperbolic tangent function, <span class="math inline">\(\tanh^{-1}\)</span>, is also called
the Fisher transformation.</p>
</div>
</div>
<h3><i style="font-size: 110%; color:#990017;">References</i></h3>
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