我的代码如下：
forvalues c = 1/`e(nclasses)'{
quietly replace class = `c' if cpmax==cp`c'
}
forvalues c = 1/`e(nclasses)'{
quietly summarize pr if class == `c' & y==1
local n=r(N)
local a=r(mean)
quietly summarize pr `c' if class == `c' & y==1
local b=r(mean)
matrix pr = nullmat(pr)\`n',`c',`a',`b'
}
matrix colnames pr = "Obs" "Class" "Uncond_PR"
matrix pr,name (columns)
修改好几遍了，不知道为啥运行结果一直是1 invalid name，求大佬帮忙看一下