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Re: st: Panel Data Analysis Question


From   "Clive Nicholas" <clivelists@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Panel Data Analysis Question
Date   Sun, 20 Jul 2008 06:02:08 +0100

John Magill wrote:

> I am trying to figure out if Panel Data Analsysis is the most appropriate procedure to use to  analyze some data
> We are conducting an impact assessment of a development project is South Asia.  There is a control group and a test group. We have administered a questionnaire at the beginning of the study, and are now going back in to administer a follow-up survey two years later. There are only two points in time -- that of the original survey and that of the followup survey.  We want to know if the changes over time are significantly different for the test and control groups.
> Some of the variables are continuous varibles (income in time 1 versus income time 2), where we want to know which of the two groups (control or test) has experienced the greastest increase in income.   Others are various forms of scales -- such as "How would you rate your income?": 1=Very good, 2=Good,3=Neither Good nor Bad, 4=Bad, 5 = Very Bad.-- where we want to see if perceptions have changed over time and which group has changed the most between time  1 and time 2.
> Is Panel Data (as in the "Longitudinal/Panel Data" manual) the appropriate approach to take in analyzing thse two types of questions with control and test groups, or is there a more appropriate procedure for doing this?

IMHO, you're better off just using OLS including a dummy variable for
the surveys. If you find autos, heteros or both at post-estimation,
switch to -prais-, -reg, cluster()- or (from SSC) -ivreg2-
respectively and re-run the models.

-- 
Clive Nicholas

[Please DO NOT mail me personally here, but at
<clivenicholas@hotmail.com>. Thanks!]

"Courage is going from failure to failure without losing enthusiasm."
-- Winston Churchill
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