Stata官方命令：display _request，接受键盘输入，与用户交互
用程序实现交互，比如让用户选择分析的数据集，如果输入auto，这执行命令集1；如输入auto2，则执行命令集2。
display "Which data set do you want to use?" _request(_dataset)
if "`dataset'" == "auto" {
dis "auto" // CODE TO PROCESS DATA SET A
}
if "`dataset'" == "auto2" {
dis "auto2" // CODE TO PROCESS DATA SET B
}
使用全局宏：
display "Which data set do you want to use?" _request(dataset)
use `"$dataset"', clear
if `"$dataset"' == "A" {
// CODE TO PROCESS DATA SET A
}
if `"$dataset"' == "B" {
// CODE TO PROCESS DATA SET B
}
出处:https://www.statalist.org/forums/forum/general-stata-discussion/general/1516330
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