Factor and simplex models for repeated measures: application to two psychomotor measures of alcohol sensitivity in twins.

@article{Boomsma1989FactorAS,
  title={Factor and simplex models for repeated measures: application to two psychomotor measures of alcohol sensitivity in twins.},
  author={Dorret I. Boomsma and Nicholas G. Martin and Peter C. M. Molenaar},
  journal={Behavior genetics},
  year={1989},
  volume={19 1},
  pages={79-96}
}
As part of a larger study, data on arithmetic computation and motor coordination were obtained from 206 twin pairs. The twins were measured once before and three times after ingesting a standard dose of alcohol. Previous analyses ignored the time-series structure of these data. Here we illustrate the application of simplex models for the genetic analysis of covariance structures in a repeated-measures design and compare the results with factor models for the two psychomotor measures. We then… CONTINUE READING

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