O-statistics, or overlap statistics, measure the degree of community-level trait overlap. They are estimated by fitting nonparametric kernel density functions to each species’ trait distribution and calculating their areas of overlap. For instance, the median pairwise overlap for a community is calculated by first determining the overlap of each species pair in trait space, and then taking the median overlap of each species pair in a community. This median overlap value is called the O-statistic (O for overlap). The Ostats() function calculates separate univariate overlap statistics for each trait, while the Ostats_multivariate() function calculates a single multivariate overlap statistic for all traits. O-statistics can be evaluated against null models to obtain standardized effect sizes. 'Ostats' is part of the collaborative Macrosystems Biodiversity Project "Local- to continental-scale drivers of biodiversity across the National Ecological Observatory Network (NEON)." For more information on this project, see the Macrosystems Biodiversity Website (<https://neon-biodiversity.github.io/>). Calculation of O-statistics is described in Read et al. (2018) <doi:10.1111/ecog.03641>, and a teaching module for introducing the underlying biological concepts at an undergraduate level is described in Grady et al. (2018) <http://tiee.esa.org/vol/v14/issues/figure_sets/grady/abstract.html>.
|Depends:||R (≥ 3.5.0)|
|Imports:||sfsmisc, matrixStats, circular, hypervolume, ggplot2, gridExtra, viridis, grid, MASS|
|Suggests:||testthat (≥ 2.1.0), knitr, rmarkdown|
|Author:||Quentin D. Read [aut, cre], Arya Yue [aut], Isadora E. Fluck [aut], Benjamin Baiser [aut], John M. Grady [aut], Phoebe L. Zarnetske [aut], Sydne Record [aut]|
|Maintainer:||Quentin D. Read <quentin.read at usda.gov>|
|License:||MIT + file LICENSE|
|CRAN checks:||Ostats results|
|Windows binaries:||r-devel: Ostats_0.1.1.zip, r-release: Ostats_0.1.1.zip, r-oldrel: Ostats_0.1.1.zip|
|macOS binaries:||r-release (arm64): Ostats_0.1.1.tgz, r-oldrel (arm64): Ostats_0.1.1.tgz, r-release (x86_64): Ostats_0.1.1.tgz, r-oldrel (x86_64): Ostats_0.1.1.tgz|
|Old sources:||Ostats archive|
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