Found this interesting comment re full scale IQ and what Americans call learning disabilities. It was a novel way to describe things.
The Full Scale IQ is an averaging of these five scales, so it’s only meaningful if the scales are consistent. If a child is superior in verbal reasoning, but below average in visual spatial skills, the full scale number looks average. It’s akin to having an average body temperature because your hair is on fire while your feet are in a bucket of ice water.
I think the Wechsler IQ test is the standard IQ test done in both the USA and U.K. I had that test done in 2010 when I was 24 and scored IQ 69 making me in the learning disabled group. I don’t know how accurate it is but the psychologist who did it looked through all my school reports from age 5 to 16 to gain a bigger picture plus he looked at my language therapy reports from age 5 too.
The Wechsler test is also done on death row inmates.
I’ve only ever done one official IQ at school when I was 15. I asked many years later for the results but they no longer had them.
I know from book based tests that my ability with verbal questions is far greater than my ability with non-verbal ones . Same goes for the more reputable online tests. Verbally I am in the upper extreme range and non-verbally I’m in the well below average range. I average 77 +40 +73 =63.33 for the three most reliable non-verbal tests online(JCTI untimed, JCTI timed and Mensa Hungary.) If I take out the JCTI timed it’s 75. Around 75 seems to be my average including less reputable tests.
Averaging these out would give an IQ in the average range , but the analogy in my previous post describes things well when there are big differences between verbal and non-verbal.
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