Tukey

Computes the probability and quantile that the studentized range, each based on n means and with df degrees of freedom

See functions: qtukey() and ptukey() from statistical software: R

The algorithm is based on that of the reference.

Copenhaver, Margaret Diponzio & Holland, Burt S. Multiple comparisons of simple effects in the two-way analysis of variance with fixed effects. Journal of Statistical Computation and Simulation, Vol.30, pp.1-15, 1988.