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...he approach model<-glm(biomass~Shore*Raked*Species+Shore*Fished*Species) And then run post-hoc adjusted pairwise comparisons between signifcant terms. Does this look OK to you guys? Many, many thanks Chris -- View this message in context: http://r.789695.n4.nabble.com/R-stats-newcomer-help-tp3764819p3764819.html Sent from the R help mailing list archive at Nabble.com.