<p>Few days back I took an IQ test (<a href="http://test.mensa.no/" rel="nofollow noreferrer">online mensa norway</a>) 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). </p>

<p>I know that online tests are not valid, possibly explaining the lower score of 85. Nonetheless, <a href="https://en.wikipedia.org/wiki/Mensa_International" rel="nofollow noreferrer">mensa</a> seems OK,as they claim that their test was correlated with other standardized tests.</p>

<p>So my question is: can IQ within- test (<em>i.e.</em>., 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?</p>

CC BY-SA 4.0
2019-09-25T07:13:25.280Z
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.
Steven Jeuris
CC BY-SA 4.0
2019-09-25T09:16:51.763Z
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.
AliceD
<measurement><methodology><iq>
Can some one operate 15 points lower during some part of the day and then return to normal?
Sussan
# Can some one operate 15 points lower during some part of the day and then return to normal?

(Asked by: username_0 on 2019-09-24)

Few days back I took an IQ test ([online mensa norway](http://test.mensa.no/)) 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](https://en.wikipedia.org/wiki/Mensa_International) 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?

**Tags:** measurement, methodology, iq

> **Comments:**
> **username_1**: 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.  
> **username_2**: I have attempted to frame the question better. Is the post reflecting your question, username_0? Feel free to revert the changes or improve the post yourself to your liking.  

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## 0 answers

