hello,
my project involves merging two very large data sets . I used an id number to merge the two data sets and got 95% to match using the code : merge m:m id using data1.dta .

i was told to use an additional id code to try to get the other 5% to match. I m not sure how to do this in stata. I just want to match/merge with the ones that were not previously matched with the first merge.

any feedback if this can be done?

thanks
Vishal