本人想将数据库A和数据库B进行匹配,其中企业名称(firm)是共同变量。firm在A库中可能会重复出现,在B库中是唯一值。运行出来的结果如下:
/* merge based on "firm" and save */
. merge m:1 firm using 2011industrial
(note: variable firm was str75, now str87 to accommodate using data's
values)
Result # of obs.
-----------------------------------------
not matched 304,824
from master 4,142 (_merge==1)
from using 300,682 (_merge==2)
matched 0 (_merge==3)
-----------------------------------------
. save all,replace
file all.dta saved
.
end of do-file
匹配不成功。看note好像是str的问题,请问大家这个要怎么修改呢?Thanks♪(・ω・)ノ