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Using iweights for districts [message #10986]

Fri, 14 October 2016 23:58

shayankhan
Messages: 16
Registered: September 2016
Location: Karachi, Pakistan

Member

Hi,

I want to run the xtlogit model with fixed effects to control for district level heterogeneity. I was told to use iweights for this as the xtlogit command does not accept pweights. My question is two-fold:

1-How do I calculate these iweights?
2-Would using only the weights and not accounting for the survey design (using the svy estimation) affect the validity of my estimation?

Note:- It was recommended to me by Dr.Kit Baum, a highly respectable figure and well known econometrician to use the xtlogit model with iweights rather than using the svy:logistic estimation with district dummies as this approach might not give consistent estimates due to the incidental parameter problem.

Thanks.

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Re: Using iweights for districts [message #11001 is a reply to message #10986]

Mon, 17 October 2016 14:11

Bridgette-DHS
Messages: 3038
Registered: February 2013

Senior Member

Following is a response from Senior DHS Stata Specialist, Tom Pullum:

Quote:

Usually, to use iweights, you just insert "[iweight=v005/1000000]" into the estimation command, before the comma (options come after the comma).

Omitting the other adjustments in the svyset command, for clusters and stratification, will affect the standard errors and confidence intervals, not the estimates. I believe that xtset and svyset are not compatible in the current version (14) of Stata. I'm not 100% sure about this--I hope other users can contribute their experience.

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Re: Using iweights for districts [message #11002 is a reply to message #11001]

Mon, 17 October 2016 14:49

shayankhan
Messages: 16
Registered: September 2016
Location: Karachi, Pakistan

Member

Thanks Tom. I actually decided to go along with PSU fixed effects as each PSU within a district would capture more heterogeneity. Appreciate your input throughout my queries.

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