Dear R list, is it possible to force the intercept to assume the value of 0 (that is no intercept) in gam from gam package? Regards -- Corrado Topi Global Climate Change & Biodiversity Indicators Area 18,Department of Biology University of York, York, YO10 5YW, UK Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk