Question

我在以下示例数据中创建一个名为result的变量，如果下注是赢，则显示'W'，如果是下注，则显示'L'。

如何通过每个用户名的时间戳按行严格按行逐行连接此变量？

clear
input str16 username str40 betdate winnings
player1 "12NOV2008:19:04:01" -10
player1 "12NOV2008:12:03:44" 50
player2 "07NOV2008:14:03:33" -50
player2 "05NOV2008:09:00:00" -100
end

generate double timestamp=clock(betdate,"DMY hms") 
format timestamp %tc

cap drop result
generate result = "L"
replace result = "W" if (winnings >0)

cap drop resulthistory
generate resulthistory = ""
replace resulthistory = concat(resulthisory + result), by(USERNAME timestamp)

Answer 1

读者应注意问题的最后一行是幻想语法;其余的都会奏效。

这可能是你寻求的。请注意，当您重新读取数据时，您capture drop的变量不会存在。

clear
input str16 username str40 betdate winnings
player1 "12NOV2008:19:04:01" -10
player1 "12NOV2008:12:03:44" 50
player2 "07NOV2008:14:03:33" -50
player2 "05NOV2008:09:00:00" -100
end

gen double timestamp=clock(betdate,"DMY hms") 
format timestamp %tc

gen result = cond(winnings > 0, "W", "L") 

bysort username (timestamp): gen resulthistory = result[1] 
by username : replace resulthistory = resulthistory[_n-1] + result if _n > 1 
by username : replace resulthistory = resulthistory[_N] 

list

Stata：按条件连接字符串变量

1 个答案: