22 Jul
2009
22 Jul
'09
11:18 a.m.
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 match.data function provided in the MatchIt
package?
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
22 Jul
22 Jul
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
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23 Jul
23 Jul
9:55 a.m.
Hi Stefano,
You certainly did help; it worked perfectly. And your description of the
type of object I'm dealing with spurred me to inform myself on lists, an
item I previously ignored having fixated on data frames. Thank you.
Charlie
-----Original Message-----
From: stefano iacus [mailto:stefano.iacus@unimi.it]
Sent: Wednesday, July 22, 2009 3:56 PM
To: Abromaitis, Charlie
Cc: cem(a)lists.gking.harvard.edu; Gary King
Subject: Re: [cem] Extracting Matched Data Set in cem
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
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Abromaitis, Charlie -
stefano iacus