3 ms·
First of all, scores are normalized to age (you never compare 90 to 30 years olds. Only 90 to 90-ish year olds). No serious IQ test claim to measure much more
by bjoli 6y ago
First of all, scores are normalized to age (you never compare 90 to 30 years olds. Only 90 to 90-ish year olds).
No serious IQ test claim to measure much more than 2 standard deviations up and down (meaning they all break down somewhere above 130-135 or below 70). I have done WISC/WAIS three times (as a part of a psychological assessment) and the conversion to IQ scores were within 3 points (the WAIS/WISC scale measures many different abilities, and can be converted to an "aggregate" IQ score). I asked about this and when people are healthy the tester said people tend to score very similarly on tests, even many years apart.
- Retric 6y agoYes, the score is computed relative to other 90 year olds, however people’s individual cognitive decline is heavily influenced by heath and behavior so individuals can move up or down significantly on a that relative scale. Thus the computed score at 3 doesn’t accurately predict someone’s score at 90 nearly as well as a test taken at 30 predicts someone’s score at 40. The issue with the underlying raw score at 90+ is it doesn’t map very well to a bell curve. Many people are quite healthy but a significant number are drastically reduced from their younger self.