Stability of Measures
I was looking for an online IQ test that was free, and I could use as an example in a class - I came across one at www.iqtest.com. I had to make sure that it was free, so I did the test, and made sure I got a result - and it duly arrived as an email.
However, I remembered that, sometime ago, I'd done another online IQ test, and I wondered if it was the same one. Because I'm obsessive, I keep all my email, so I trawled through my archives, and lo and behold, there, in January, 2002 (a little over 4 years previously) was my result of the test. Now, I'm not going to tell you the scores (because that would bring shame on me or be boasting, depending), but my score the second time was 14 points lower. Fourteen points! That's very nearly a standard deviation.
Either I've got a lot dimmer (it's possible - January 2002 was several months before my wife gave birth to twin boys) or there's a bit of a stability issue with that test.
A sample of one doesn't tell us a great deal, but a bit more research would be interesting.
However, I remembered that, sometime ago, I'd done another online IQ test, and I wondered if it was the same one. Because I'm obsessive, I keep all my email, so I trawled through my archives, and lo and behold, there, in January, 2002 (a little over 4 years previously) was my result of the test. Now, I'm not going to tell you the scores (because that would bring shame on me or be boasting, depending), but my score the second time was 14 points lower. Fourteen points! That's very nearly a standard deviation.
Either I've got a lot dimmer (it's possible - January 2002 was several months before my wife gave birth to twin boys) or there's a bit of a stability issue with that test.
A sample of one doesn't tell us a great deal, but a bit more research would be interesting.
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