Fisher's z-distribution

Fisher's z-distribution is the statistical distribution of half the logarithm of an F distribution variate:

$$z = \frac{1}{2} \log F $$

It was first described by Ronald Fisher in a paper delivered at the International Mathematical Congress of 1924 in Toronto, entitled "On a distribution yielding the error functions of several well-known statistics" (Proceedings of the International Congress of Mathematics, Toronto, 2: 805-813 (1924). Nowadays one usually uses the F distribution instead.