Dear R-user, I tried to generate classification / regression tree with a absence/presence matrix of species (400) in different locations (50) to visualise species which are important for splitting up two locations. Rpart and tree did not work for more than 10 species which is logical due to the limited amount of locations (n=50). However the error prompt is a "+" and no specific message, but I am pretty sure that I did not enter a false sign by mistake. Is it allowed at all to use 0/1 data for this statistical technique and if yes is there a way or different method to use all 400 species entries? Otherwise I would apply a PCA beforehand but I would prefer to have the raw species informations.
using R 2.1.1-1 (debian repos.) regards, Martin -- Martin Wegmann DLR - German Aerospace Center German Remote Sensing Data Center @ Dept.of Geography Remote Sensing and Biodiversity Unit && Dept. of Animal Ecology and Tropical Biology University of Wuerzburg Am Hubland 97074 Würzburg phone: +49-(0)931 - 888 4797 mobile: +49-(0)175 2091725 fax: +49-(0)931 - 888 4961 http://www.biota-africa.org http://www.biogis.de ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
