A factorial analysis of timed and untimed measures of mathematics and reading abilities in school aged twins.

@article{Hart2010AFA,
  title={A factorial analysis of timed and untimed measures of mathematics and reading abilities in school aged twins.},
  author={Sara A. Hart and Stephen A. Petrill and Lee Anne Thompson},
  journal={Learning and individual differences},
  year={2010},
  volume={20 2},
  pages={63}
}
The present study examined the phenotypic and genetic relationship between fluency and non-fluency-based measures of reading and mathematics performance. Participants were drawn from the Western Reserve Reading and Math Project, an ongoing longitudinal twin project of same-sex MZ and DZ twins from Ohio. The present analyses are based on tester-administered measures available from 228 twin pairs (age M=9.86 years). Measurement models suggested that four factors represent the data, namely… CONTINUE READING

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