On Mon, 2 Jul 2007, Jenifer Larson-Hall wrote: > Hi, > I used to get a really useful graph when I ran the following command > using the MASS library: > >> cov.rob(cbind(dekeyser$AGE,dekeyser$GJTSCORE),cor=T) > > Besides the regular output, a graph appeared that had the classical > correlation and the robust correlation, and two ellipses, one > surrounding the data that would be used in the classical correlation and > the other surrounding the data in the robust correlation.
But all the data are 'used in the classical correlation'. Maybe you mean a tolerance ellipse for the implied bivariate normal distribution? > I've searched through the MASS library but don't see a separate command > that could produce this graph. Does anyone know whether one exists, or > did the graph just disappear in the newer version of R? It was never in the MASS *package*. cov.rob() is mainly intended for multidimensional problems, not 2D ones. It is possible you were using methods from package 'robustbase', such as covPlot? The author of cov.rob. > Thanks for any help, > Dr. Jenifer Larson-Hall > Assistant Professor of Linguistics > University of North Texas > (940)369-8950 -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.