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- Title
Meta-analysis of variation: ecological and evolutionary applications and beyond.
- Authors
Nakagawa, Shinichi; Poulin, Robert; Mengersen, Kerrie; Reinhold, Klaus; Engqvist, Leif; Lagisz, Malgorzata; Senior, Alistair M.; O'Hara, Robert B.
- Abstract
Meta-analysis has become a standard way of summarizing empirical studies in many fields, including ecology and evolution. In ecology and evolution, meta-analyses comparing two groups (usually experimental and control groups) have almost exclusively focused on comparing the means, using standardized metrics such as Cohen's / Hedges' d or the response ratio., However, an experimental treatment may not only affect the mean but also the variance. Investigating differences in the variance between two groups may be informative, especially when a treatment influences the variance in addition to or instead of the mean., In this paper, we propose the effect size statistic ln CVR (the natural logarithm of the ratio between the coefficients of variation, CV, from two groups), which enables us to meta-analytically compare differences between the variability of two groups. We illustrate the use of lnCVR with examples from ecology and evolution., Further, as an alternative approach to the use of lnCVR, we propose the combined use of ln s (the log standard deviation) and
- Subjects
ECOLOGICAL research; EVOLUTIONARY theories; META-analysis; VARIATIONS (Musical composition); COMPARATIVE studies
- Publication
Methods in Ecology & Evolution, 2015, Vol 6, Issue 2, p143
- ISSN
2041-210X
- Publication type
Article
- DOI
10.1111/2041-210X.12309