Further considerations for power in sibling interaction models
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Updated: Aug 5, 2026

Peering into the Dynamics of Social Interactions: Measuring Play Fighting in Rats
Published on: January 18, 2013
Benjamin M Neale1, Fruhling V Rijsdijk
1Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, King,s College, London, UK. b.neale@iop.kcl.ac.uk
Abstract:
Sibling interactions aim to determine whether siblings' phenotype have an impact on one another. We explore the power to detect sibling interaction term in twin models with the inclusion of singletons (only children). Furthermore, we develop the existing work on the improvement of power from the addition of unrelateds (adoptive or step-siblings). We find that singletons are considerably more powerful under cooperative (positive or imitation) than competitive (negative) interaction. Additionally, the power from URs is attenuated when common environment is part of the genetic model.
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