Dear R, I have 3 sets of data x1, x2 and x3. I have plotted them against my independent variable 'Time' using the "abline" feature of a GLM model. I would like to test if the slopes of those models are significantly different from x1. I would appreciate any help given, I am a self taught statistician and as we all know, the literature can be quite dense, it's not easy for a 20 something year old. Thank you in advance, Stephen ----- University of St Andrews, sm2284 at st-andrews.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/Comparing-and-Analysing-Slopes-from-GLM-abline-tp4651100.html Sent from the R help mailing list archive at Nabble.com.