I updated my Statistics page today. I added links to and descriptions of a number of files that I’ve been meaning to make available for some time.
Previously, there was just a single Matlab function for finding maximum likelihood estimates for a 2×2 GRT model given a 4×4 confusion matrix on that page. Now there is also an associated function for plotting the fitted model.
There is also an R script for fitting a multilevel Bayesian GRT model to multiple subjects’ data, an associated R function for plotting (sub-parts of) the fitted model, and an associated R function for plotting the observed and predicted identification-confusion probabilities. You can read all about this Bayesian model, and you can see plots generated by these functions, in this paper.