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Weighting in IV approach [message #26507]

Mon, 27 March 2023 16:56

Alanood
Messages: 18
Registered: November 2022

Member

Hello

I am doing my first paper as PhD student and I am using panel data for Egypt - KR file for 2005, 2008, and 2014.
I append them in one file and I extract all the childern above two years old.
I am testing the realtionship between maternal employment and child health (stunting, wasting, underweight, and overweight).

The Analysis Approach: 1- OLS 2- IV-Instrument variable.

I usually start my analysis by add svy: in the begining, which is conducted by:
***********************svy*************
gen strata=v023
gen psu=v021
gen sampwt=v005/1000000
svyset psu, strata(strata) weight(sampwt) vce(linearized) singleunit(centered)
.
.
.****************************STATA command********************
.****************Analysis****************
****OLS*****
svy: regress stunted motheremployed child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) )
svy: regress wasted motheremployed child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) )
svy: regress overweight motheremployed child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) )
svy: regress underweight motheremployed child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) )

*****IV******
******IV-unweighting****
ivregress 2sls stunted child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) ) (motheremployed= instrument ), robust first
.
.
*******IV- wieghting*******
.
ivregress 2sls stunted child characteristics mother characteristics partner characteristics Household characteristics (fixed effect (year) (governorates) ) (motheremployed= instrument ) [pweight = sampwt], vce(cluster v021) first

.........****************************************

My question here is relted to the result that I got from in IV approach, the result are differ between weighting and unweighting IV appreoach

IV- weighting
the variable mother employment 0/1 - is significat at 5% in(wasted- in IV weighted regresion)
IV- not weighting
the mother employment 0/1 - is significat at 5% in(stunted -wasted-overweight- in IV unweighted regresion )

So I am wondering that
1- why the result is differ between weighting and unweighting.
and 2- In my paper can I include the unweighting regression or it yields unseginificant result.

Thank you and I appreciate your guidance.

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[Message index]

		Weighting in IV approach By: Alanood on Mon, 27 March 2023 16:56
		Re: Weighting in IV approach By: Bridgette-DHS on Tue, 28 March 2023 09:19
		Re: Weighting in IV approach By: Alanood on Tue, 28 March 2023 17:35
		Re: Weighting in IV approach By: Alanood on Tue, 28 March 2023 19:40
		Re: Weighting in IV approach By: Bridgette-DHS on Wed, 29 March 2023 08:47
		Re: Weighting in IV approach By: Alanood on Thu, 30 March 2023 06:37

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