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Oct 1, 2021 at 12:36 comment added Carl Witthoft @User Thanks! not only that but zipfR over at CRAN has a bunch of reverse funcs
Sep 30, 2021 at 16:40 comment added Maximilian Janisch @CarlWitthoft Indeed there is, see functions.wolfram.com/GammaBetaErf/InverseBetaRegularized for some properties of this inverse function.
Jul 28, 2021 at 22:40 history edited soakley CC BY-SA 4.0
Added an R plot showing the beta pdf
Jul 26, 2021 at 12:48 comment added Carl Witthoft @soakley I bet "somewhere" there's a "reverse beta" function (or at least a series expansion) that could converge to the desired value :-)
Jul 23, 2021 at 20:18 comment added soakley I've found a similar combination (74.00000000 %) with $\alpha=1.0$ and $\beta=0.146238255.$
Jul 23, 2021 at 20:13 comment added Dave I have gotten quite close ($74.00025\%$) with $\alpha = 0.9999052$ and $\beta = 0.1462295$.
Jul 23, 2021 at 19:59 comment added Galen Presumably the parameters can be tweaked to obtain exactly 74%. Close enough, but feel free to revise the example to precisely match 74%.
Jul 23, 2021 at 19:55 vote accept Galen
Jul 23, 2021 at 19:28 history answered soakley CC BY-SA 4.0