That's not really comparable, though. That question is "what's your birthday", not "answer a bunch of ambiguous questions and see if the made up blurb that results is applicable to you".

There's also the aspect of giving the "right" answers to achieve a desired result. It's not very difficult to e.g. get an inrovert or extrovert type, and everyone knows that "real" hackers are introvert, so...

Basically it's not science, definitely not in this form.

[edit: I would have expected more extroverts in the results here, since the target audience is entrepreneurial hackers. Maybe it's the proggit exodus that's showing?]

I doubt that people actually bother to lie on the test to get a specific result, especially here. Noone knows anyone else's type, and even if they did, they could always just lie.

My point was that the constant claims that these categorisations were qualitatively indistinguishable from the zodiac are patently false, and there's the evidence.