DOI: 10.1111/2041-210x.12504 ISSN:

SIMR: an R package for power analysis of generalized linear mixed models by simulation

Peter Green, Catriona J. MacLeod
  • Ecological Modeling
  • Ecology, Evolution, Behavior and Systematics



allows users to calculate power for generalized linear mixed models from the
4 package. The power calculations are based on Monte Carlo simulations.

It includes tools for (i) running a power analysis for a given model and design; and (ii) calculating power curves to assess trade‐offs between power and sample size.

This paper presents a tutorial using a simple example of count data with mixed effects (with structure representative of environmental monitoring data) to guide the user along a gentle learning curve, adding only a few commands or options at a time.

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