*stata中，

*若已知X服从正态分布，且H0:E(X)=u

ttest X=u

*若未知X服从哪种分布，且H0:median(X)=m

signtest X=m

多谢版主，ranksum可以做中位数检验吗？有何不同
2# sungmoo

首先，看ranksum的命令结构：ranksum,by()，它对数据结构的要求不同。

其次，看ranksum的说明：ranksum tests the hypothesis that two independent samples (i.e., unmatched data) are from populations with the same distribution by using the Wilcoxon rank-sum test, which is also known as the Mann-Whitney two-sample statistic (Wilcoxon 1945; Mann and Whitney 1947).

学习了，谢过
4# sungmoo