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Direct linkKelley, Ken; Rausch, Joseph R. – Psychological Methods, 2011
Longitudinal studies are necessary to examine individual change over time, with group status often being an important variable in explaining some individual differences in change. Although sample size planning for longitudinal studies has focused on statistical power, recent calls for effect sizes and their corresponding confidence intervals…
Descriptors: Intervals, Sample Size, Effect Size, Longitudinal Studies
Keenan, Janice M.; Betjemann, Rebecca S.; Wadsworth, Sally J.; DeFries, John C.; Olson, Richard K. – Journal of Research in Reading, 2006
We report preliminary behaviour genetic analyses of reading and listening comprehension from The Colorado Learning Disabilities Research Center. Although the twin sample with these new measures is still of limited size, we find substantial, and significant, genetic influences on individual differences in both reading and listening comprehension.…
Descriptors: Environmental Influences, Word Recognition, Reading Comprehension, Listening Comprehension
