This is a code that my group partner sent me. If its relevant, she works on an Apple laptop and mine is Windows. All the other codes say the exact same thing and I'm not sure what the problem is. I would really appreciate some help.
Age is indeed undefined.
Is HEADS a data.frame? In that case, try with table(HEADS$Age).
Or, run the attach(HEADS) part after the names(...) call, and then try table(Age).
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