siarelicit: Elicit prior parameters for the Dirichlet distribution.
In siar: Stable Isotope Analysis in R

Description Usage Arguments Details Author(s)

Allows users to enter mean estimated proportions and a standard deviation term so that useful prior distributions can be enterred into the siarmcmcdirichletv4 function.

1	siarelicit(siardata)

siardata

A list containing some or all of the following parts: targets, sources, corrections, PATH, TITLE, numgroups, numdata, numsources, numiso, SHOULDRUN, GRAPHSONLY, EXIT, and output. For more details of these inputs see the siarmenu function.

Uses standard results from the Dirichlet distibution to turn the estimated mean proportions M[i] and a variance term V[1] to give the estimated parameters a[i] via:

a[i] = M[i] ( (M[1] (1-M[1]))/V[1] - 1 )

Note that V can be given for any of the k sources.

Andrew Parnell

siar documentation built on May 2, 2019, 11:02 a.m.