The R Book

qoiqpwqr 发表于 2015-4-15 20:22
https://s.pinggu.org/search.php?mod=forum&searchid=9703&orderby=lastpost&ascdesc=desc&searchsubmit=ye ...

It means you don't know!!!!

richardchan003 发表于 2015-4-17 02:43
It means you don't know!!!!

我是不知道啊，这就是为什么我让搜一下的原因

https://bbs.pinggu.org/thread-219858-1-1.html

https://bbs.pinggu.org/thread-2359118-1-1.html

https://bbs.pinggu.org/thread-3058061-1-1.html