Matching firms based on size, industry and roa

[Kiki Qu]

Hi all!

Just want to know how to match firms on STATA. I'm doing a research studying the impact restatements have on firms' discretionary accruals. Now I have all the data ready: a file contains all the restating firms and another file that contains firms that did not restate in the sample period. I want to use DID model in further tests, but first, I need to find each observation a control firm. Firms will be matched based on size, industry and ROA. Just looking for the easiest way to match firms. No PSM (propensity score matching) needed. Please give me some directions. Thanks in advance!

[Øyvind Snilsberg]

check out -merge- and -joinby-. if you need further advice, please provide a data example using -dataex-.

[Kiki Qu]

Hi there! Thanks for your reply. I've already solved the problem. Thank you very much!

[jiji mat]

Hi . which code did you use to solve the problem . It will be very helpful if you can paste it here .
Thanks