Thanks; this is useful.
________________________________________
From: Ariel Linden, DrPH [ariel.linden(a)gmail.com]
Sent: Wednesday, August 24, 2011 6:16 PM
To: 'Gary King'; Nel Dutt
Cc: cem(a)lists.gking.harvard.edu
Subject: RE: [cem] Using CEM with Panel Data in Stata
I would argue that it depends on whether the analysis is intended to be longitudinal or cross-sectional. If a firm is matched to others in one year, but then matched to others in the next year, they may not be following the same trajectory over time. This may be irrelevant if the intent is to show cross-sectional results at each time interval. However, if the intent is to show the trajectory over time, perhaps it makes sense to match at the baseline (or first time interval) and then observe the trajectories over time.
Ariel
From: owner-cem_at_lists_gking_harvard_edu(a)mail.hmdc.harvard.edu [mailto:owner-cem_at_lists_gking_harvard_edu@mail.hmdc.harvard.edu] On Behalf Of Gary King
Sent: Wednesday, August 24, 2011 6:09 PM
To: Nel Dutt
Cc: cem(a)lists.gking.harvard.edu
Subject: Re: [cem] Using CEM with Panel Data in Stata
there's nothing necessarily wrong with this strategy. the only question for you is whether those matches are really sufficiently equivalent. matching different years means that for sure there will be some differences (even if only the last digit of the year!), but you're going to need to decide whether those make a difference in your analysis and the effect of that on the outcome is important enough.
Gary
--
Gary King - Albert J. Weatherhead III University Professor - Director, IQSS - Harvard University
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On Wed, Aug 24, 2011 at 5:44 PM, Nel Dutt <nilanjana.dutt(a)duke.edu<mailto:nilanjana.dutt@duke.edu>> wrote:
Hi all,
I am using CEM on a panel dataset with the k2k option. I am currently matching observations by year (and a few other covariates). I was wondering if there are any econometric problems while running regressions (post matching) with a matched sample which contains the following situation:
in year t observation_1 is matched with observation_2, but in year t+1 observation_1 is matched with observation_3. That is, in different years the same firm is matched with different firms.
Thanks,
Nel
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Hi all,
I am using CEM on a panel dataset with the k2k option. I am currently matching observations by year (and a few other covariates). I was wondering if there are any econometric problems while running regressions (post matching) with a matched sample which contains the following situation:
in year t observation_1 is matched with observation_2, but in year t+1 observation_1 is matched with observation_3. That is, in different years the same firm is matched with different firms.
Thanks,
Nel
Hello-
I have been trying to install CEM for SPSS 19. I followed every installation
step and I think it was successfully installed. But when I run the program,
it gives me the error messages as below:
GET
FILE='E:\Users\Michiko\Desktop\lalonde.sav'.
>Warning. Command name: GET FILE
>SPSS Statistics data file "E:\Users\Michiko\Desktop\lalonde.sav" is written
in a character encoding (ISO_8859-1:1987)
>incompatible with the current LOCALE setting. It may not be readable.
>Consider changing LOCALE or setting UNICODE on. (DATA 1721)
DATASET NAME DataSet1 WINDOW=FRONT.
CEM TREATMENT=treated VARIABLES=age education black married nodegree re74
re75.
>Error # 6887. Command name: BEGIN PROGRAM
>External program failed during initialization.
>Execution of this command stops.
Additional error message: Load Python library failed.
>Error # 6887. Command name: BEGIN PROGRAM
>External program failed during initialization.
FREQUENCIES VARIABLES=age
/ORDER=ANALYSIS.
I also followed the instuction for troubleshooting (
http://projects.iq.harvard.edu/cem-spss/pages/troubleshooting) so I got no
error message on R, so I should be okay on this one.. Can someone please
help me figure out what I need to do to successfuly run CEM on SPSS?
Thank you!
Michiko Clutter
--
Michiko Otsuki Clutter, PhD
Assistant Professor in Psychology
University of South Florida, St. Petersburg
140 7th Avenue South, Davis Hall 258
St. Petersburg, FL 33701
(TEL) 727-873-4867