Error in analysis due to pandas bug

@TomAugspurger, I found pandas-dev/pandas#22509 by chasing down an error in part 2. You use the broken form of groupby().transform('rank') in "Chaining methods", to create this graph:

If you use dep_time.rank() instead you get the correct result

See pandas-dev/pandas#22509 (comment) for comparison of rank() and currently broken transform('rank').

ping @TomAugspurger, have you seen this yet? you're so responsive on pandas, but this has been here for a few days, just wondering.

[TomAugspurger]

Seen it. Won't have time to look for a while though.

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On Thu, Jun 13, 2019 at 2:39 PM pilkibun ***@***.***> wrote: ping @TomAugspurger <https://github.com/TomAugspurger>, have you seen this yet? you're so responsive on pandas, but this has been here for a few days, just wondering. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AAKAOIWCBZQLGBFEKHER52LP2KPAXA5CNFSM4HWFCC22YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXU2COI#issuecomment-501850425>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAKAOISS4ILJW5ELFMTGZ23P2KPAXANCNFSM4HWFCC2Q> .