i've been banging my head against rpart for a few days now (trying to make classification trees for this dataset that I have), and I think it's time to ask a lifeline at this point :-) I'm sure it's something silly that I'm not seeing, but here's what I've been doing:
EuropeWater <- read.csv(file=paste("/Users/artessaniccola/Documents/",
"Magic Briefcase/CityTypology/Europe_water.csv",sep=""))
library(rpart)
attach(EuropeWater)
names(EuropeWater)
[1] "City" "waterpercapita_m3" "water_class" "population"
[5] "GDPpercapita" "area_km2" "populationdensity" "climate"
EuropeWater$water_class <- factor(EuropeWater$water_class, levels=1:3,
labels=c("Low", "Medium", "High"))
EuropeWater$climate <- factor(EuropeWater$climate, levels=2:4,
labels=c("Arid", "Warm temperate", "Snow"))
EuropeWater_tree <- rpart(EuropeWater$water_class ~
population+GDPpercapita + area_km2 + populationdensity +
EuropeWater$climate,
data=EuropeWater, method=class)
Error in as.character(x) :
cannot coerce type 'builtin' to vector of type 'character'
and for the life of me, I can't figure out what the Error is about.
Any thoughts would be most appreciated!!!!