Hi R-sig-ecology. Writing with another adonis (vegan) model specification question. I have 10 regions (REGION) where I collected biological samples. Within each region, I established 10 sites (SITE). At each site, I collected 3 samples each using a different method (METHOD). I'd like to test if each of the three sampling methods recovers the same biological community. Since there is no replication within sites for the different sampling methods, I think that I will have to do this within regions grouping site level data by sampling method. I have come up with the model formulas below, but could use advice on the appropriate specification. DISTANCES ~ METHOD with strata = REGION DISTANCES ~ REGION + METHOD with strata = REGION Should nesting be specified? Should SITE be included somehow? Any help is much appreciated. Thanks. Brian
Brian A. Gill, Ph.D. (He/Him) Postdoctoral Research Associate School of Natural Resources and the Environment University of Arizona, Tucson, Arizona, USA www.BrianGillPhD.com [[alternative HTML version deleted]]