R help - Jun 2002 - more in contour plot for non-linear models

Dear all,

Many thanks for your help in the contour plot for non-liner models. I've
have found in the ellipse package an easy way to obtain the confidance
region for a pair of parameters, for almost any model. 
But my question is the following. Exist some function to obtain the
confidance regions for the regression parameters ( the same plot that
appears in page 255 of Venables and Ripley book) ? 


Josep Perarnau i Codina,      josep.perarnau at upc.es
Universitat Polit?cnica de Catalunya
Facultat de Matem?tiques i Estad?stica
LIOS - Laboratori d'Investigaci? Operativa i Simulaci?
Tel:  +34 93 4016947          Fax:  +34 93 4015855 
Pau Gargallo 5                     
08028 Barcelona


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