[user5994461]

They are really just maths algorithm, seen in maths courses or found with a quick google search.

The typical reddit developer who got a job without a degree is unaware of many many things.

The typical developer who got a job with a hardcore interview at random financial company and is surrounded by other master's and PhD. Not so much.

The typical tech company doesn't need much advanced analysis. If they could figure out how many recurring users and revenues they have, that would be a good start :D