求助在stata12.0版中想把两个文件按照变量hhid横向合并,写出的命令为:
use "D:\stata实验数据\201206\Master_Agriculture_201206\m12farmg.dta", clear
use "D:\stata实验数据\201206\Master_Agriculture_201206\m12cropt.dta", clear
merge 1:1 hhid using "D:\stata实验数据\201206\Master_Agriculture_201206\m12farmg.dta"
为什么显示错误信息“variable hhid does not uniquely identify observations in the master data”呢?
恳求各位大师的解答~~~