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ArisKatsaris 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.
Got 135 on the first test. Got 139 on the Stanford-Binet/USA scale (stdev 16) in the second. This seems about right.
But since the second one was polite enough to tell me which answers I got wrong, I have to call bullshit on it: some of the "correct" answers it claimed made no sense, and seemed more wrong and illogical than the ones I had placed.