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army1987 comments on 2011 Less Wrong Census / Survey - Less Wrong
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Here's one that closely imitates Raven's Progressive Matrices and claims to have been calibrated with a sample of 250,000 people: http://www.iqtest.dk/
Here's another one: http://sifter.org/iqtest/ . I can't find any mention of where the questions came from or how it's calibrated, but it's shorter and doesn't require Flash.
Neither one asks for an e-mail address or any identifying information. They might be too easy for some on LW, but harder ones tend to cost money. As Viliam_Bur pointed out, any free online test's validity is questionable, but the first one is basically a direct copy of a "real" test, and neither one has any apparent ulterior motive. Anecdotally, they were both within 10 points of each other and my "real" score.
The first test gave me a score a few points below that on the Mensa site I did a few years ago, but I gave up early on a few questions (I had about 10 minutes left when I finished).
One weird thing about it is that there were so many questions based essentially on the same idea, which makes me think it would be possible to have a test with not-too-much-worse accuracy but half as many questions (unless they intended to test ‘stamina’ as well -- but I'd guess that that varies more for a same person depending on how much they've slept recently than across people).