On 2010-03-09 04:40, valeriano.parravic...@unige.it wrote:
Hi,
I have a problem with ctree of party package.
I have data on distribution of more than one species (about 50 species) and I
would like identify the relation of this multivariate object (species
distribution) with a number of explanatory variables.
rs is the name of my dataframe containing the species (columns from 2 to 51) and
the explanatory variables (columns 52 and 53). Rows are my sampling sites.
I wrote:
species<-rs[,2:51]
v1<-rs[,52]
v2<-rs[53]
tree<-ctree(species~v1+v2)
It does not work , but when I use the same formula for the univariate case (i.e.
a single column - e.g. the total number of species in each samplig sites) it
works. I know that ctree can handle multivariate response variables, but I
cannot figure out how to do that.
The response variables needs to be explicitly specified, e.g. ctree(y1 +
y2 ~ x1 + x2) gives you a bivariate response.
HTH,
Henric
Someone can help me?
Thank you
Valeriano
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