joining or merging two datasets

If you want to join them, then you need a common index variable between the two datasets, if you want to add them togetter then they must have at least one dimension in common, eather the number of colummns (rbind()) or the number or rows (cbind()).

And, as usual, please use a reproducible example to do this kind of questions, it is not only easier to help you, but also is polite of you.

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