alt Hacker NewsBy its fundamental design, an observational study cannot account for everything. That is the critique and it is a valid one.
Replies
wvenable • today at 3:19 AM
Most observational studies do in fact account for the first thing a random HN poster can come up with 5 seconds after reading the title. So there is very little value in such a comment.
That's true, and it's also one of those factoids that everybody already knows but certain people can't help themselves from bringing up every time it's even tenuously relevant.