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jeremysalwen comments on 2012 Less Wrong Census/Survey - Less Wrong
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I strongly suspect that a lot of the members of LessWrong have had a non-internet IQ test and will have entered their scores on the census. Those who also took the extra credit internet test and entered their scores to that as well could serve as a sample group for us to make just such an analysis.
Granted, we are likely a biased sample of the population (I suspect a median of somewhere around 125 for both tests), but data is data.
From what I could read on the iqtest page, it seemed that they didn't do any correction for self-selection bias, but rather calculated scores as if they had a representative sample. Based on this I would guess that the internet IQ test will underestimate your score (p=0.7)
Unless there are significant numbers of people, myself for example, who take the test multiple times with varied random algorithms just to see how it affects the outcome. I'd only put a (p=0.55) at the test underestimating your score, conditional that it doesn't correct for self-selection bias.
Though, given that the lowest score appears to be "less than 79", rather than an exact number, they may simply drop any scores under 79 from their pool, or at the very least weight them differently. Has anybody identified a similar maximum score which would support this hypothesis of discarding outliers?
Analysis of the survey results seems to indicate that I was correct: http://lesswrong.com/lw/fp5/2012_survey_results/