On Thu, Mar 9, 2023 at 1:16 PM Dean Rasheed <dean.a.rash...@gmail.com> wrote: > On Wed, 8 Mar 2023 at 23:24, Thomas Munro <thomas.mu...@gmail.com> wrote: > > ... But Oracle, and I think > > several other analytics-focused SQL systems, can do it in a very easy > > built-in way. I think to get at that you probably need the t CDF, and > > in there[2] I see... Γ(). Huh. > > Hmm, possibly having the gamma function would be independently useful > for other things too. I don't want to get side-tracked though.
I guess if we did want to add some nice easy-to-use hypothesis testing tools to PostgreSQL, then perhaps gamma wouldn't actually be needed from SQL, but it might be used inside C code for something higher level like tcdf()[1], or even very high level like t_test_independent_agg(s1, s2) etc. Anyway, just thought I'd mention those in passing, as I see they arrived together; sorry for getting off topic. [1] https://stats.stackexchange.com/questions/394978/how-to-approximate-the-student-t-cdf-at-a-point-without-the-hypergeometric-funct
