If a patient scores say 2 standard deviations less than expected at arithmetic, then how reliably can we claim the same of WM or FSIQ?

It seems that the mean score for arithmetic, for the population (people who suffer from schizophrenia), is more or less the same as mean WM and FSIQ scores (around 85).

I assume the answer is just not very reliably at all, but I'm curious. However, it would be useful to gauge the reliability of doing so, just because arithmetic is much more often tested than anything approaching FSIQ or even WM.

  • $\begingroup$ more importantly why would anyone care eh $\endgroup$ – user3293056 Aug 7 '18 at 22:06

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