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（2）宽变长：reshape wide variable,i(hhid)j(year)
错误代码no; data are mi set Use mi reshape to perform reshape on these data. mi reshape has the same syntax as reshape.
Perhaps you did not type reshape. In that case, the command you typed calls reshape and it is not
appropriate for use with mi data. Use mi extract or mi xeq to select the data on which you want to
run the command, which is probably m=0.
r(119);
感谢老师们的解答！
部分原始数据示例：
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