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...y to call the resulting object Cx12, e.g. with 'summary(Cx12)', I receive an "Error: object 'Cx12' not found". If anyone has a solution to the above problem, or alternative solutions to getting the decomposition done, I would much appreciate the help! Regards, Aino Aino Hosia Postdoc Havforskningsinstituttet/Institute of Marine Research PO Box 1870 Nordnes, N-5817 Bergen, Norway (Nordnesgaten 50) Tel: +47 55 23 53 49 E-mail: aino.hosia@imr.no<mailto:aino.hosia@imr.no> www.imr.no<http://www.imr.no/> [[alternative HTML version deleted]]

...can I somehow compare the models M1 and M2? Trying anova(M1,M2) gives the message: "Error in eval(expr, envir, enclos) : object 'fixed' not found" (and I am anyway not sure if this is a valid approach between Poisson and negbin gamms). I am most grateful for any help! Aino Aino Hosia Postdoc Havforskningsinstituttet/Institute of Marine Research PO Box 1870 Nordnes, N-5817 Bergen, Norway (Nordnesgaten 50) Tel: +47 55 23 53 49 E-mail: aino.hosia@imr.no<mailto:aino.hosia@imr.no> www.imr.no<http://www.imr.no/> [[alternative HTML version deleted]]

...I plot the interaction with x1 (time) on x-axis and s(x1):x2 on y-axis, can I somehow relate the value of the interaction term at a particular point in time to the slope of the linear x2 term at that point in time? Appreciate any help with this as I am relatively new to both r and gam(m). Aino Hosia Postdoc Institute of Marine Research PO Box 1870 Nordnes, N-5817 Bergen, Norway (Nordnesgaten 50) Tel: +47 55 23 53 49 E-mail: aino.hosia at imr.no