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...Intel P4, 3 Ghz, 1 GB RAM) and I work on a Windows XP platform. I am working on a Windows XP platform with R version 2.1 (all packages updated). Thanks for your answers. Christian -- Christian Bieli, project assistant Institute of Social and Preventive Medicine University of Basel, Switzerland Steinengraben 49 CH-4051 Basel Tel.: +41 61 270 22 12 Fax: +41 61 270 22 25 christian.bieli at unibas.ch www.unibas.ch/ispmbs

...ution, they are estimations from real data. 3. Are there general flaws or errors in my approach? Thanks a lot for any help on this! All the best, Denis -- Denis Aydin Institute of Social and Preventive Medicine at Swiss Tropical Institute Basel Associated Institute of the University of Basel Steinengraben 49 ? 4051 Basel ? Switzerland Phone: +41 (0)61 270 22 04 Fax: +41 (0)61 270 22 25 denis.aydin at unibas.ch www.ispm-unibasel.ch

...e at the same time? I don't want to create all the dataframes in my workspace first. I tried it with parentheses {}, but it obviously did not work. Thanks in advance. Christian -- Christian Bieli, project assistant Institute of Social and Preventive Medicine University of Basel, Switzerland Steinengraben 49 CH-4051 Basel Tel.: +41 61 270 22 12 Fax: +41 61 270 22 25 christian.bieli at unibas.ch www.unibas.ch/ispmbs

...I dont know if theres a way to index the two vars within lapply. There is certainly a way to do it by looping, but lapply is much more elegant. Thank you for your help. Christian -- Christian Bieli, project assistant Institute of Social and Preventive Medicine University of Basel, Switzerland Steinengraben 49 CH-4051 Basel Tel.: +41 61 270 22 12 Fax: +41 61 270 22 25 christian.bieli@unibas.ch www.unibas.ch/ispmbs [[alternative HTML version deleted]]

...ntil now I did the settings in ghostview)? 3. I did not find particulars about the pointsize option. What is the effect of changing the pointsize value? With best regards Christian -- Christian Bieli, project assistant Institute of Social and Preventive Medicine University of Basel, Switzerland Steinengraben 49 CH-4051 Basel Tel.: +41 61 270 22 12 Fax: +41 61 270 22 25 christian.bieli at unibas.ch www.unibas.ch/ispmbs