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IQ Tests Are Stable Within an Individual
There is no absolute zero on an IQ scale. It's relative to other people. The metric is such that you cannot say the person with an IQ of 140 is twice as smart as a person with anIQ of 70. So it's not stable in that way, but because it's very difficult to do these kinds of comparisons. But so what can we say about the number itself? Is that stable across tests and so on and all?