can anybody suggest a means of incorporating nested terms into a generalisd linear model? I have been using the standard .glm function. I am looking at how the response variable is affected by land use across a number of years and the cropping pattern is different each year. Other static variables such as field size etc. remain the same so I would like to nest cropping pattern within year. It would not be appropriate to treat each years data as an independent observation. -- View this message in context: http://r.789695.n4.nabble.com/nested-variables-in-a-generalised-linear-model-tp3015627p3015627.html Sent from the R help mailing list archive at Nabble.com.