Jeff, And, if you don't want to dive into Bayesian methods, the GAMLSS package allows you to specify models for location, for scale (what you want) and/or for shape. Those models can be parametric or nonparametric, including multiple types of splines.
https://www.gamlss.com/books-articles/ provides resources, including links to short course notes and a J. Stat Software article. Best, Philip [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
