you can use mata to generate all the permutation, but if you have 50 unique values, the number of variables will be 50!, which is impossible for stata to hold.  The code is, suppose you have the data in var x

mata
j=0
st_view(X = ., ., "x")
info = cvpermutesetup(X)
while ((p=cvpermute(info)) != J(0,1,.)) {
                j++
                x="p"+strofreal(j)
                st_addvar("float",x)
                st_store(.,x,p)
}

for data from 1 to 6, the code will generate 720 extra variables, then you can loop for the pairs.  But your problem is based on 50 values, you can see how large 50! is, seems not realistic.

没有看懂什么意思
如果是排列组合，percom命令可以实现。

最好举个例子！

combin x, k(2)                                          
combin x, k(3)

你好，请问percom命令如何下载或安装呢？我折腾了好久，内部命令findit，search，ssc install都试过了，网页上也找了，还是没安装上。请赐教，谢谢！