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  • This worked great, thanks! i know this is a pretty basic question, so i am thankful of your time and effort. Commented Jan 6, 2021 at 15:23
  • just for anyone else that might be looking at this - Ultimately, i used ZealousWeb's solution because it contains an outer join and i discovered that not all user_ids appeared in all dataframes, creating some NaNs. including how="outer" kept these records from being dropped so was, in my opinion, the best solution. Commented Jan 6, 2021 at 16:35