Hell is new and improved. The new version is in the same old place: http://www.burns-stat.com/pages/Tutor/R_inferno.pdf An explanation of the changes is at: http://www.portfolioprobe.com/2011/05/02/the-r-inferno-revised/ -- Patrick Burns pburns at pburns.seanet.com twitter: @portfolioprobe http://www.portfolioprobe.com/blog http://www.burns-stat.com (home of 'Some hints for the R beginner' and 'The R Inferno')