Calculating effect sizes in animal social network analysis

Daniel W. Franks*, Michael N. Weiss, Matthew J. Silk, Robert J. Y. Perryman, Darren P. Croft

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

1. Because of the nature of social interaction or association data, when testing hypotheses using social network data it is common for network studies to rely on permutations to control for confounding variables, and to not also control for them in the fitted statistical model. This can be a problem because it does not ad-just for any bias in effect sizes generated by these confounding effects, and thus the effect sizes are not informative in the presence of confounding variables.
2. We implemented two network simulation examples and analysed an empirical dataset to demonstrate how relying solely on permutations to control for con-founding variables can result in highly biased effect size estimates of animal social preferences that are uninformative when quantifying differences in behaviour.
3. Using these simulations, we show that this can sometimes even lead to effect sizes that have the wrong sign and are thus the effect size is not biologically interpretable. We demonstrate how this problem can be addressed by controlling for confounding variables in the statistical dyadic or nodal model.
4. We recommend this approach should be adopted as standard practice in the statistical analysis of animal social network data.
Original languageEnglish
Pages (from-to)33-41
Number of pages9
JournalMethods in ecology and evolution
Issue number1
Early online date18 Jun 2020
Publication statusPublished - 10 Jan 2021

Keywords / Materials (for Non-textual outputs)

  • Animal social networks
  • Social behaviour
  • Social network analysis


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