search for: coeic

Hello all, I've tried to reproduce the contour plot that appears in the book of Venables and Ripley, at page 255. Is a F-statistic surface and a confidence region for the regression parameters of a non-linear model. It uses the stormer data that are in the MASS package. I haven't been able to reproduce the plot either in R ( version 1.5 ) and S. It makes the axes and it puts the

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