Hi, Does anyone know if it is possible to extract the whole data set from an nls object? I tried 'nls.object'$data but it only provides the name of the data frame with no direct access to content of this data frame. Do you have an idea?? Thanks in advance. Florent BATY -- _______________________________________ Florent BATY CNRS UMR 5558 Dynamique des Populations Bact?riennes Facult? de M?decine Lyon-Sud 69921 OULLINS, BP 12 FRANCE tel : +33 (0)4 78 86 31 67 fax : +33 (0)4 78 86 31 49