E.g. Add Health has an open subsample that has a subset of variables, and a very hard to get closed version with much more stuff. How to classify? Hmm.
If it requires something more than automatically approved open registration (e.g. NLSY79), I classify it as closed data. There are degrees of closedness, e.g. based on price or tenure requirements, IRB, it's a little tricky to classify further. Some datasets are half-open.
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