R help - Jan 2012 - Propensity score matching in R using Classification tree method

I can able to calculate the propensity score using classification tree
method.
And if i am trying to find the PS matching i am getting error.(Error in
Match(Y = Y, Tr = Tr, X = ps0) : length(Y) != length(Tr))

Propensity score matching:
library("rgenoud")
library("Matching")
data("Passport")
attach("Passport")

Y<-Passport$A3
Tr<-Passport$fserv_cd
rr1<-Match(Y=Y, Tr = Tr, X= glm1$fitted)
[in above command i am getting Error in Match(Y = Y, Tr = Tr, X = ps0) :
length(Y) != length(Tr)]

Matchbalance(fserv_cd~ A4,match.out=rr1,nboots=1000,data=Passport)

Please suggest me right approach for Propensity score matching using
classification trees(if possible code me) .
ps0-propensity score values

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A single tree will undermatch subjects.
Frank

ardsiiitmg wrote
> 
> I can able to calculate the propensity score using classification tree
> method.
> And if i am trying to find the PS matching i am getting error.(Error in
> Match(Y = Y, Tr = Tr, X = ps0) : length(Y) != length(Tr))
> 
> Propensity score matching:
> library("rgenoud")
> library("Matching")
> data("Passport")
> attach("Passport")
> 
> Y<-Passport$A3
> Tr<-Passport$fserv_cd
> rr1<-Match(Y=Y, Tr = Tr, X= glm1$fitted)
> [in above command i am getting Error in Match(Y = Y, Tr = Tr, X = ps0) :
> length(Y) != length(Tr)]
> 
> Matchbalance(fserv_cd~ A4,match.out=rr1,nboots=1000,data=Passport)
> 
> Please suggest me right approach for Propensity score matching using
> classification trees(if possible code me) .
> ps0-propensity score values
> 

-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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