cap program drop mysum
program mysum
version 15.0
args var // 输入项 help args
tempvar x1 x2 // 定义两个暂时性变量
gen `x1' = sqrt(`var')
gen `x2' = ln(`var')
dis in y "The summary of `var' is: "
sum `var'
dis _n in y "The summary of sqrt(`var') is:"
sum `x1'
dis _n in y "The summary of ln(`var') is:"
sum `x2'
end
sysuse nlsw88, clear
mysum wage
问题是:dis in y 以及dis _n in y是什么意思,我删除这个命令运行结果还是一致的。


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