search for: res_plot

Hello List: I'm writing in R some code to produce plots for residual analysis and diagnostics in linear regressions.  An example of the plots produced is given for downloading at http://dl.dropbox.com/u/25445316/res_plots.png .  Regarding the example plot, I'd like to point out that: 1) Tendency lines based on lowess estimations are drawn as green continuous curves, 2) "Extra" variables or components (variables not in the model formula, but in the original dataframe or otherwise specified by the user)...