A fishR user asked me if I had Weisberg Linear Growth Model (LGM) vignette. In the past, the Weisberg LGM referred to the fixed-effects models described in Weisberg (1993) and implemented in software that was written in XLISP-STAT and distributed through Minnesota Sea Grant. [I do, actually, have a vignette that implements that technology in R but I do not distribute it because it is out-dated.] More recently, however, Weisberg et al. (2010) described a mixed-effects model for fish growth. I have not yet developed a vignette for these models but, fortunately, Dr. Weisberg uses those models as examples in his classes at the University of Minnesota. Thus, available at his website, is a detailed example with corresponding R code.
At some point I would like to develop some helper functions for the FSA package to streamline some of the analysis in his example. At that time, I will develop a more detailed vignette. However, this is unlikely for the near future.
Filed under: Fisheries Science, R, Statistics Tagged: Growth, Mixed model, R