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Published online by Cambridge University Press: 08 February 2018
Holzinger set up his equations to show the combination of the factors—nature (A), nurture (B), and error(E)—which go to make up a score obtained by a particular twin on a particular test. If iX1 and iX2 are the twins in an identical pair and fX1 and fX2 are the twins in a fraternal pair then: —
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