我现在手上有两个数据表,traffic和es。想把这两个表通过共同的变量region合并起来。我输入的命令是:merge 1:1 region using traffic。一直提示错误是:variable region does not uniquely identify observations in the master datar(459);
Keywords: r(459)
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[P] error . . . . . . . . . . . . . . . . . . . . . . . . Return code 459
something that should be true of your data is not;
data have changed since estimation;
This is the generic form of this message; more likely, you
will see messages such as "y must be between 0 and 1" or
"x not positive". You have attempted to do something that,
given your data, does not make sense.
刚开始接触stata软件,不是很懂到底哪里出了问题...
有朋友可以帮帮忙吗?


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