Maomiao Peng

Hi there, I found that the computation of rank-biserial correlation (RBC) is problematic. This is related to https://github.com/raphaelvallat/pingouin/issues/417 and https://github.com/raphaelvallat/pingouin/pull/424. According to [the cited paper](https://journals.sagepub.com/doi/pdf/10.2466/11.IT.3.1), there are three ways to...