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...linear regression, fitting X based on Y is not a good idea because of the way OLS calculates the slope and intercept. Is the same problem found in GLM/Poisson regression? Moreover, I also have a Poisson error on Ymax that I would have to consider, right? Help!!!! -- Vincent Philion, M.Sc. agr. Phytopathologiste Institut de Recherche et de D?veloppement en Agroenvironnement (IRDA) 3300 Sicotte, St-Hyacinthe Qu?bec J2S 7B8 t?l?phone: 450-778-6522 poste 233 courriel: vincent.philion at irda.qc.ca Site internet : www.irda.qc.ca