MarkusRamikin 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.
I got 130 on the first one and 156/137 on the second.
Going with the lower result for the purpose of Yvain's survey. I found the second result a little suspect because a lot of questions on the second test made little sense to me. I would often see 2-3 possible answers that made more or less equal (small) sense to me, and had to take a gut feeling guess on which the author might have possibly meant.
Maybe I just got lucky. Or my gut is a better thinker than I suspected.