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st: panel data and impact estimation


From   Manuel Chávez <mchavez@evalalianza.org.mx>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: panel data and impact estimation
Date   Fri, 19 Aug 2005 13:27:39 -0500

I have 5 household surveys, from 1999-2004, all beneficiaries of a rural
development program in Mexico, each year with different people. The samples
are representatives at the state level (32 states), so I could make the
agrupation by state and obtain a panel of 32X5 observations. I also have a
variable for Rural Development Districts (DDR), that are territorialy
smaller entities than states, so I could try to build a bigger panel, but
I'm not sure if the samples by DDR are representaives. My intention is to
use instrumental varaibles for estiamting income.

My questions are:

1) If it is possible to estimate the impact of the program just having
beneficiaries into the panel?

2) How many are enough observations? (32X5?)

Manuel


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