| Variable Y\X | Quantitiative X | Ordinal X | Nominal X |
| Quantitative Y | Pearson r | Biserial rb | Point Biserial rpb |
| Ordinal Y | Biserial rb | Spearman rho/Tetrachoric rtet | Rank Biserial rrb |
| Nominal Y | Point Biserial rpb | Rank Bisereal rrb | Phi, L, C, Lambda |
需要搞清楚的细节还很多。
参考:
https://www.andrews.edu/~calkins/math/edrm611/edrm13.htm
https://en.wikipedia.org/wiki/Phi_coefficient
http://web.pdx.edu/~newsomj/pa551/lectur15.htm


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