Hi Sarah, Thank you for your response. Here is a toy example:
library(MatchIt) data(lalonde) A<-lalonde f<-treat ~ age + I(age^2) + educ + I(educ^2) + black + hispan + married + nodegree + re74 + I(re74^2) + re75 + I(re75^2) m<-"nearest" m.out.base <- matchit(formula=f, data=A, method=m) B <- match.data(m.out.base) An <- nrow(A) Bn <- nrow(B) Cn <- An - Bn C <- ?? >________________________________ >From: Sarah Goslee <sarah.gos...@gmail.com> >To: Ana Kolar <annako...@yahoo.com> >Cc: R <r-help@r-project.org> >Sent: Tuesday, 28 June 2011, 18:44 >Subject: Re: [R] extracting data > >Hi Ana, > >On Tue, Jun 28, 2011 at 12:28 PM, Ana Kolar <annako...@yahoo.com> wrote: >> Let's say I have an original data set which is called A and data extracted >> from this original data set, called B. Based on these A and B data set I >> would like to get data set C which includes all the remaining data from the >> data set A after we exclude data of the data set B. >> >> Any idea how to do this? > >Yes. Several. > >But to know which one to suggest, I need to know more about your data. > >How about a toy example, so the list members can see your index >variables, etc? Or how you created the subset B, and why you can't >just use the opposite of that procedure? > >Sarah >-- >Sarah Goslee >http://www.functionaldiversity.org > > > [[alternative HTML version deleted]]
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