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Re: Stratification [message #1472 is a reply to message #1467]

Mon, 03 March 2014 12:12

Trevor-DHS
Messages: 803
Registered: January 2013

Senior Member

The implicit stratification is an ordering that has been made prior to selection of the clusters, and it is that ordering that permits the implicit stratification. However, I would suggest using the explicit strata defined at the time of the sample design - that is what DHS does now. The strata are generally the urban and rural areas in each region, but not always. Read appendix A of the final reports to confirm what is used for each survey.

I would not say that the sampling errors are incorrect or inadvisable. With using the implicit stratification, the assumption is that there is some improvement over simply randomly selecting the sample in a strata, thus the sampling errors tend to be slightly smaller and the confidence intervals slightly narrower. However, DHS has decided to be more conservative in its estimates of sampling error and confidence intervals and using the original design strata, you will get slightly wider confidence intervals. Of course, the difference is typically tiny and frequently negligible.

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[Message index]

		Stratification By: hlyons on Mon, 03 February 2014 20:09
		Re: Stratification By: Bridgette-DHS on Wed, 26 February 2014 09:20
		Re: Stratification By: hlyons on Thu, 27 February 2014 14:52
		Re: Stratification By: Trevor-DHS on Fri, 28 February 2014 11:40
		Re: Stratification By: hlyons on Fri, 28 February 2014 14:35
		Re: Stratification By: Trevor-DHS on Mon, 03 March 2014 12:12
		Re: Stratification By: hlyons on Mon, 03 March 2014 13:12
		Re: Stratification By: Trevor-DHS on Mon, 03 March 2014 14:49
		Re: Stratification By: Trevor-DHS on Mon, 03 March 2014 15:13
		Re: Stratification By: hlyons on Mon, 03 March 2014 18:08

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