hyperzeit

To me, this alone could also be a collider/Berkson's paradox: Conditioning on making the cut, there is a negative correlation because you make the cut by either being extremely skillful or by having great certifications – one compensates the other. That in turn would mean that certifications are actually positively correlated with getting employed at Google.

You need the full picture, that is people not making the cut to exclude this pattern.

How come, pytest does not appear in the post?

But a login is not the same as a truly active user/customer. At least in my bubble, people log in/open the app out of FOMO, check if there is anything new, most likely find nothing intriguing, and log out/close the app again. Rinse and repeat every week.

You are confusing p(psychosis|cannabis) with p(cannabis|psychosis)

One of the scores of lists people share and bookmark but never use themselves.