22 Jul
2009
22 Jul
'09
3:55 p.m.
Hi Charles,
the output of the cem function returns an object with several slots.
In particular, $matched is a boolean vector for matched/unmatched units.
Here is an example of use
library(cem)
data(LL)
dim(LL)
[1] 722 12
mat <- cem("treated", LL,
drop="re78")
mat
G0 G1
All 425 297
Matched 222 163
Unmatched 203 134
LLmatched <- LL[mat$matched,]
dim(LLmatched)
[1] 385 12
hope this helps
stefano
On 22/lug/09, at 17:18, Abromaitis, Charlie wrote:
Perhaps someone can assist me with a question I have
about the cem
package. After matching with cem, I would like to obtain the data
set of the matched cases. Is there a function in cem that would
allow me to do this, similar to the
I also want to take this opportunity to thank the developers of the
MatchIt and cem packages for providing these tremendous resources.
Charles Abromaitis, AACI
Senior Property Appraiser/Negotiator
Corporation of The City of London
Realty Services Division
Phone: (519) 661-2500 Ext. 4713
Fax: (519) 661-5087
-
cem Mailing List, served by Harvard-MIT Data Center
Send messages: cem(a)lists.gking.harvard.edu
[un]subscribe Options: http://lists.gking.harvard.edu/?info=cem
More information on cem: http://gking.harvard.edu/cem