indictest: Significance-assessment of spatial early-warning signals
In spatialwarnings: Spatial Early Warning Signals of Ecosystem Degradation

Description Usage Arguments Details Value References See Also

Assess the significance of spatial early-warning values

1	indictest(x, nperm = 999, ...)

`x`	A spatial warning object such as one produced by the `*_spews` function family
`nperm`	The number of permutations to carry out to produce the null distribution
`...`	Additional arguments passed to methods

The significance of many early-warning signals can be estimated by reshuffling the original matrix. Indicators are then recomputed on the shuffled matrices and the values obtained are used as a null distribution. P-values are obtained based on the rank of the observered value in the null distribution.

An object of class *_spews_test depending on the input object (actually, a data.frame)

Kefi, S., Guttal, V., Brock, W.A., Carpenter, S.R., Ellison, A.M., Livina, V.N., et al. (2014). Early Warning Signals of Ecological Transitions: Methods for Spatial Patterns. PLoS ONE, 9, e92097

generic_spews, spectral_spews

spatialwarnings documentation built on May 2, 2019, 5:16 p.m.