ellipseBackTransform: Back-transform a z-score siber ellipse to original location...

In AndrewLJackson/SIBER: Stable Isotope Bayesian Ellipses in R

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::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.

AndrewLJackson/SIBER documentation built on June 7, 2024, 3:21 a.m.