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Reformulating and Simplifying the DF Analysis Model

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Abstract

DeFries-Fulker (DF) Analysis for unselected populations is reformulated as a no-intercept model with centered variables and only two independent variables. The reformulation serves three purposes. First, the original formulation implicitly estimated two different values for c 2 and two values for h 2 . The new formulation resolves this ambiguity. Second, because the original formulation estimated h 2 with the coefficient from a regression-interaction term, whether to center the interaction variables was unclear. The new formulation explicitly resolves this issue. Finally, the new formulation estimates fewer parameters, and therefore improves estimation efficiency and statistical power.

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Authors and Affiliations

  1. Department of Psychology, University of Oklahoma, Norman, OK, 73019, USA

    Joseph Lee Rodgers

  2. Department of Sociology, University of Pennsylvania, Philadelphia, PA

    Hans-Peter Kohler

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  1. Joseph Lee Rodgers
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  2. Hans-Peter Kohler
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Correspondence to Joseph Lee Rodgers.

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Lee Rodgers, J., Kohler, HP. Reformulating and Simplifying the DF Analysis Model. Behav Genet 35, 211–217 (2005). https://doi.org/10.1007/s10519-004-1020-y

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  • DOI: https://doi.org/10.1007/s10519-004-1020-y

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