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I have opened an SPSS dataset in JASP, but I cannot see a way of selecting a subset of cases is JASP to work on.
Is that possible?
I don't believe so - I haven't found this capability either. For now I have worked around it by saving a duplicate data set for each subset I am interested in.
I would love to see this functionality added to JASP.
Yes! The next version will have data editing through a "sync and update" option, but filtering will be a separate feature for a release in the near future.