Hello Everyone! I am new to STATA and I am trying to run sample matching. Recently a friend of mine told me about the optimal matching command in STATA
the code is : optmatch2 new_rank_dum3 size, min(1) max(2) gen(matching)

The above code works perfectly fine! However, I am a bit confused about the difference between optimal matching and Propensity score matching..
I know that PSM is the more widely used technique.. I was looking up the internet to see what the difference is but I wasn't able to find good information on optimal matching..

Does anyone know the difference or have any good references that I can review?? Thank you so much!!