Dear Victoria
I have used CEM in my PhD research to realise 1:1 matched samples as shown
in the attached document. So, it is possible. However, I did not use the R
package but rather the SPSS add-on. I downloaded the software and the
manual for installing the add-on online. I searched for the SPSS software
extension bundle on my system, and i am sending a copy. But unfortunately,
I could not find the manual. But if you are interested in using it, you can
find it online.
Best wishes
Oladele Campbell
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Today's Topics:
1. How to get matched pairs from CEM? (Victoria Graham)
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Message: 1
Date: Thu, 9 Jul 2020 03:10:09 +0000
From: Victoria Graham <victoria.graham(a)mq.edu.au>
To: "cem(a)lists.gking.harvard.edu" <cem(a)lists.gking.harvard.edu>
Subject: [cem] How to get matched pairs from CEM?
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Hi,
I am using Coursened Exact Matching to improve balance in my sample. The
summary matching results after applying CEM are that 11,128 pixels have
been matched:
Sample sizes:
Control Treated
All 19741 8283
Matched 6728 4400
Unmatched 13013 3883
Discarded 0 0
Firstly, is it possible to specify 1:1 matching with CEM? I want to only
retain matched pairs, which requires the same amount of pixels in my
treatment & control groups.
I am also having trouble getting a unique identifier for each matched pair
so that I can calculate the difference between the treatment and control. I
am using the code:
pair: Produces a paired sample out of a CEM match solution
When I execute the below command, it says there are 0 matches.
# we want a set of paired units
pairsample <- pair(match.out_cem, data)
Total number of units paired in CEM strata: 0
Total number of units matched: 0
Can anyone help or point me in the right direction?
Thanks, Tori
Victoria Graham | MPhil., PhD candidate
Macquarie University NSW 2109 Australia
T: +61 2 9850 6298 | E: victoria.graham(a)mq.edu.au<mailtolto:
victoria.graham(a)mq.edu.au>
Twitter:@ToriFGraham<https://twitter.com/ToriFGraham>
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