The performance of permutations and exponential random graph models when analyzing animal networks

Julian C. Evans, David N. Fisher, Matthew J. Silk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Social network analysis is a suite of approaches for exploring relational data. Two approaches commonly used to analyze animal social network data are permutation-based tests of significance and exponential random graph models. However, the performance of these approaches when analyzing different types of network data has not been simultaneously evaluated. Here we test both approaches to determine their performance when analyzing a range of biologically realistic simulated animal social networks. We examined the false positive and false negative error rate of an effect of a two-level explanatory variable (e.g., sex) on the number and combined strength of an individual's network connections. We measured error rates for two types of simulated data collection methods in a range of network structures, and with/without a confounding effect and missing observations. Both methods performed consistently well in networks of dyadic interactions, and worse on networks constructed using observations of individuals in groups. Exponential random graph models had a marginally lower rate of false positives than permutations in most cases. Phenotypic assortativity had a large influence on the false positive rate, and a smaller effect on the false negative rate for both methods in all network types. Aspects of within- and between-group network structure influenced error rates, but not to the same extent. In "grouping event-based" networks, increased sampling effort marginally decreased rates of false negatives, but increased rates of false positives for both analysis methods. These results provide guidelines for biologists analyzing and interpreting their own network data using these methods.

Original languageEnglish
Pages (from-to)1266-1276
Number of pages11
JournalBehavioral Ecology
Volume31
Issue number5
DOIs
Publication statusPublished - 12 Sep 2020

Keywords

  • Exponential random graph model
  • Permutation
  • Randomization
  • Social network analysis

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