SIBER: ellipseBackTransform – R documentation

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ellipseBackTransform

Back-transform a z-score siber ellipse to original location and scale.

Description

Back-transforms a bivariate siber ellipse fitted to z-scored data to the original location and scale. Not intended for direct call by users.

Usage

ellipseBackTransform(jags.output, siber, idx.community, idx.group)

Arguments

`jags.output`	a mcmc.list object of posterior samples created by `rjags`. In siber this is created typically by `fitEllipse`
`siber`	a siber object as created by createSiberObject.
`idx.community`	an integer specifying which community to back-transform.
`idx.group`	an integer specifying which group to back-transform.

Value

A 6 x n matrix representing the back-transformed posterior distributions of the bivariate normal distribution for a specified group within a specified community, where n is the number of posterior draws in the saved sample. The first four columns are the covariance matrix Sigma in vector format. This vector converts to the covariance matrix as matrix(v[1:4], nrow = 2, ncol = 2). The remaining two columns are the back-transformed means.

SIBER

Stable Isotope Bayesian Ellipses in R

v2.1.6

GPL (>= 2)

Authors

Andrew Jackson and Andrew Parnell

Initial release