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Important issue: do you set up codes at the beginning of the process and make different ones as you advance or you just enter everything and code at the end? well, I think starting to code the firms, plants, countries at the beginning is the best way, especially in my case, where things do not change radically from year to year. In this case, you just need to make sure that everything is up to date and just add new codes for new entries (plants, firms, countries). So, if I were to do it again, I would assign codes from the very start. But again, it might be different in each case.
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