Description
A google of "rolling apply" for me yields:
https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.core.window.Rolling.apply.html
Which results in an HTTP 403. Working link now is:
https://pandas.pydata.org/docs/reference/api/pandas.core.window.rolling.Rolling.apply.html
As pointed out by @TomAugspurger seems to be an issue with window.Rolling.apply vs window.rolling.Rolling.apply (/docs should be a symlink to /pandas-docs/stable)