Hi Philip, your data are event times because you're monitoring the same trees in each plot over time, the event being death of a tree.
Therefore methods from survival analysis are more appropriate. Start out having a look at the package survival, possibly considering a Cox model with adjustment for clusters or with strata (the function coxph()) or a parametric model using the function survreg(). Christian ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
