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Weighting appended samples using different countries' KR data files. [message #23440]

Thu, 16 September 2021 05:02

Melese
Messages: 17
Registered: August 2019

Member

Dear Experts, greetings.
I appended KR data files from different countries for further analysis.
I created a sample weight, wgt (gen wgt=v005/1000000)for each country's data file before the append.
I then appended the files and started the further analysis. Am I wrong, please?
Should I de-normalize the women's individual sample weights (v005) before the append? If so, how can I do it, please?
thank you in advance.
Regards

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Re: Weighting appended samples using different countries' KR data files. [message #23441 is a reply to message #23440]

Thu, 16 September 2021 11:38

Bridgette-DHS
Messages: 2804
Registered: February 2013

Senior Member

There have been many similar postings on this topic - see two such posts below:

https://userforum.dhsprogram.com/index.php?t=msg&goto=36 2&&srch=pooling#msg_362
https://userforum.dhsprogram.com/index.php?t=msg&goto=35 70&&srch=pooling#msg_3570

You can also access the FAQs page to read about normalization:

https://dhsprogram.com/data/analysis-faqs.cfm #4. What is the normalization of weights?

If these do not provide enough information, please search the user forum for additional posts, using strings like: "pooling", "appending", "normalize'.

[Updated on: Thu, 16 September 2021 11:43]

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Re: Weighting appended samples using different countries' KR data files. [message #23443 is a reply to message #23441]

Thu, 16 September 2021 14:21

Bridgette-DHS
Messages: 2804
Registered: February 2013

Senior Member

Following is a response from DHS Senior Sampling Specialist, Mahmoud Elkasabi:

There have been many postings about the weights in appended files. We have an FAQ about normalized weights (see #4 under weights section): https://dhsprogram.com/data/analysis-faqs.cfm . Equations and Stata code for de-normalization have been presented in MR27: https://www.dhsprogram.com/pubs/pdf/MR27/MR27.pdf

Note that if you do a full denormalization, then the pooled results will be dominated by the largest country. An alternative is to give equal weight to each survey. The options are discussed in previous postings.

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Re: Weighting appended samples using different countries' KR data files. [message #23445 is a reply to message #23443]

Thu, 16 September 2021 22:30

Melese
Messages: 17
Registered: August 2019

Member

Thank you Bridgette and Mahmoud for the timely responses. I always appreciate.
So, given the alternatives and risks of majority dominance, I chose the "equal weight for each survey" alternative.
That is I generate individual sample weight var, wgt for each survey before appending.
gen wgt= v005/1000000 and then append. I hope I am not wrong.
Regards.

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Re: Weighting appended samples using different countries' KR data files. [message #23448 is a reply to message #23445]

Fri, 17 September 2021 11:02

Bridgette-DHS
Messages: 2804
Registered: February 2013

Senior Member

Following is a response from DHS Senior Sampling Specialist, Mahmoud Elkasabi:

I'm afraid that appending the surveys as you described is not correct because surveys with large sample size will dominate the analysis regardless of the country size. I would advise you to take another look at the posted discussions on this issue as we mentioned earlier.

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