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Children completed a cognitive test known as Raven's standard progressive matrices (SPM) in separate rooms. They were given verbal instructions and completed the test at their own pace. 5 sets of 12 questions covering a range of cognitive abilities.
Adult participants completed a similar but more advanced test known as Raven's advanced progressive matrices (APM). They were given written instructions and also worked at their own pace. Although the number and arrangements of questions and sets were slightly different, both types of tests produced comparable results.
In their analysis of the data, the researchers used two different theoretical models to determine whether spousal resemblance could be better explained by phenotypic assortment or social homogamy
phenotypic assortment suggests that assortative mating occurs because individuals choose one another because they have similar intelligence level
social homogamy is the idea that because people with similar intelligence levels are clustered together in the same environment they are more likely to end up having children together.
Spousal correlation for Rasch IQ estimates was moderately high, which confirms existing evidence that individuals are more likely to mate with partners of similar intellectual ability. The statistical modelling showed this may be better explained by phenotypic assortment
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