[R] Assign Observations to Tree Nodes

[Jeff Coughlin]

Hi, is there a way to assign observations from a dataset to nodes of a tree?  

For example, if I have a data frame like the following:

ID Var1 Var2 Var3 … VarX 
1           
.           
.           
.           
n           

And then run a classification tree with this form:
tree <- ctree(Var1 ~ Var2 + Var3 + ... + VarX, data=set)

I would like to produce a vector for each node containing the observations 
("ID"s) that are contained within that node.  Or really, any output that would 
tell me what observations are contained within nodes.  My goal is to run 
logits/other analyses on certain nodes and be able to easily pinpoint subsets 
of the original data frame who meet the criteria of certain nodes.

Thanks in advance for any help/suggestions.

Jeff
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