Skip to content

Search Archives

Search tips
from:Name Search by author name, e.g. from:Duncan Murdoch "exact phrase" Match an exact phrase word1 word2 Match messages containing both words Date range Use the date pickers to filter results to a time period

Use the list dropdown to narrow results to a specific mailing list. Combine from: with other terms to filter by author and content.

3 results for “from:Johannes Ullrich”

adding mean to boxplot
Johannes Ullrich · Jan 22, 2004 · r-help

I am a new and unexperienced user of R and got so far as to know how to produce boxplots. I have no experience of messing with function code, so presently I do not know how to create a boxplot...

Scaled or unscaled variance covariance matrix
Johannes Ullrich · Mar 16, 2006 · r-help

Hi, does anyone know which of the scaled or unscaled version of the variance-covariance matrix of regression coefficients (as produced by ls.diag) is the correct one, or when one is better than the other? I am interested in...

Surface plot for polynomial regression
Johannes Ullrich · Mar 31, 2005 · r-help

Dear R-experts, my goal is to visualize the following polynomial regression as a 3D-surface: Z = b0 + b1*X + b2*Y + b3*XY + b4*X^2 + b5*Y^2 I believe that a solution to this problem may be...

Can't find what you're looking for? Try searching with Google .