I am having an issue with a procedure I need for a research application.
I am dealing with several datasets, each for a given year, since 1996 to 2020. These datasets are composed of the same columns. Namely, I have a series of files named optionm.opprcdyyyy with yyyy ranging from 1996 to 2020.
All I want to do is to create a unique file listing all of the annual datasets together.
I have then to apply some filters. I think that by creating a unified document I could much more conveniently apply my filters.
I am aware this is quite trivial, but I have been stuck on this for quite a long time.
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