In a data frame, I would like to assign two or more factors to one
observation. Is it possible? If so, how?
Example: In the variable $ dishes, there are several levels: "cup",
"plate", "saucer". In my first observation, I see a saucer only. But in
the second one, I see a cup and a saucer. In the third, however, there
is only a cup, in the fourth a plate only and so forth.
I'm an R beginner and I'll be grateful for any help.
Florian
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