Hamm v. Smith · ¶142

First, multiple IQ scores may be used to calculate a “composite score.” This approach provides a mathematically rigorous way to aggregate scores across different tests into a single, more precise estimate. APA Handbook 415–417. Indeed, a prominent psychology expert whom this Court cited in Hall suggests that the composite-score method is appropriate for estimating the “true” IQ of someone “facing the death penalty.” W. Schneider, Can't Decide Which IQ Is Best? Make a Composite Score 1 (Jan. 13, 2012), http://assessingpysche.wordpress.com/2021/01/13/cantdecidewhich-iq-is-best-make-a-composite-iq-score/; accord, D. Watson, Intelligence Testing, in The Death Penalty and Intellectual Disability 124 (E. Polloway ed. 2015) (Watson) (discussing the composite-score approach as an appropriate method in the death-penalty context).

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