Welch's t-test equivalent linear model?

[eigenfoo]

See https://eigenfoo.xyz/tests-as-linear/#5.2-Welch%E2%80%99s-t-test

The original R post (https://lindeloev.github.io/tests-as-linear/#52_welch%E2%80%99s_t-test) does not go into detail about how to modify the linear model to have different variances.

[ivanistheone]

I've added Welch's t-test (two-sample t-test with unequal variances), which can be done using GLS, see:

https://github.com/minireference/tests-as-linear/commit/98400c13b691ff1ed451ebfa9e817ca186c44d64

It's not as elegant as the R version where the model learns the sample variances on its own, but logically it's the same thing.