SIBER

SIBER: A package for fitting Bayesian Ellipses to Stable Isotope Data

Adds an ellipse around some data to an existing plot

Plot the pairwise distances and angles describing the difference between centroids of all groups

The entire set of Geese isotope data

Calculate Layman metrics on Bayesian posterior samples of a community

Calculate the overlap between two ellipses based on their posterior distributions.

Calculate the point estimates of the Layman metrics for each community

A set of concentration dependence values for stable isotope analysis

A set of trophic discrimination factors for brent geese feeding on their sources.

Read in SIBER format data and generate the SIBER object

Simulated d13C and d15N isotope-space data

Simulated d13C and d15N isotope-space data

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

Test whether a set of points are inside or outside a defined circle

Apply a normalisation transformation to vectors of data onto ellipsoids

Extract posterior means from call to siberMVN

Fit a multivariate normal distribution to x and y data using jags

A single group of the geese data

A single group of the geese data

Create a sequence of points on a circle

A utility function to simulate a single community comprised of groups

A utility function to simulate isotope data for several communities

A utility function to simulate a single group of data

Calculate maximum likelihood based measures of dispersion of bivariate data

Calculate the area of a convex hull given its coordinates

KAPOW!

Calculates the 6 Layman metrics on a vector of x and y data

Calculate the overlap between two ellipses based on the maximum likelihood fitted ellipses.

Adds convex hulls to each community to an existing plot

Adds ellipses to an existing plot for each of your groups

Plots illustrative convex hulls for each group within all communities

Creates an isotope scatterplot and provides a wrapper to ellipse and hull plotting

Test whether a set of points are inside or outside a defined ellipse

Calculate the SEA based on a posterior distribution of Sigma

Calculate the polar form of the vector between pairs of ellipse centroids

Calculate metrics and plotting information for convex hulls

Plot credible intervals as shaded boxplots using hdr.boxplot

Calculate the bayesian Standard Ellipse Area for all groups

Calculates the boundary of a union of ellipses

Fit Bayesian bivariate normal distributions to each group in each community

Calculate metrics corresponding to the Standard Ellipse based on a covariance matrix

A set of isotope observations on food sources of brent geese

Calculate the pairwise distances and angles describing the difference between centroids of paired groups