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Few days back I took an IQ test (online mensa norway) and found my IQ score to be 85. I actually had my IQ professionally tested 16 months ago by a psychologist when I was 18, and found out that I am pretty average (I got a score of 101).

I know that online tests are not valid, possibly explaining the lower score of 85. Nonetheless, mensa seems OK,as they claim that their test was correlated with other standardized tests.

So my question is: can IQ within- test (i.e.., test / re-test scores) vary over periods of time (say months to a few years, or even from a day to day basis?), or are the differences observed here better explained by between-test variability?

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  • $\begingroup$ Welcome Susan. Can you link the online test? How long ago did you do the first test? $\endgroup$ – AliceD Sep 24 at 8:07
  • $\begingroup$ I did the first test 16 months ago and for the mensa norway online test just google test.mensa.no $\endgroup$ – Sussan Sep 24 at 14:42
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    $\begingroup$ Your question is different from the anecdote you provide. The title talks about differences within a day, whereas the anecdote describes a seemingly much longer time frame. $\endgroup$ – Steven Jeuris Sep 25 at 7:13
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    $\begingroup$ I have attempted to frame the question better. Is the post reflecting your question, Sussan? Feel free to revert the changes or improve the post yourself to your liking. $\endgroup$ – AliceD Sep 25 at 9:16

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