... Q, Ma S, et al. Comparative genomics reveals convergent evolution between the bamboo-eating giant and red pandas[J]. Proc Natl Acad Sci U S A, 2017, 114(5):1081-1086.
...要线性相关这个条件。
Kendall Tau
is a statistic used to measure the ordinal association between two measured quantities.直接看公式比较容易理解:
/2})
即有序对儿(nc)的数量减去无序对儿(nd)的数量...