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Home » Data » Merging data files » Appending Multi-phase Nigerian DHS Surveys (Handling Inconsistent Value Labels and Creating a Survey Design for Multi-phase DHS Surveys)
Re: Appending Multi-phase Nigerian DHS Surveys [message #30156 is a reply to message #30150] Mon, 07 October 2024 08:33 Go to previous messageGo to previous message
Bridgette-DHS is currently offline  Bridgette-DHS
Messages: 3229
Registered: February 2013
Senior Member
Following is a response from Senior DHS staff member, Tom Pullum:

In general, the strata are constructed as combinations of v024 and v025. In most of the recent surveys, the strata are given by v022 or v023 (and they are the same) as combinations of v024 and v025.

The Nigeria 2003 survey is an exception. The sampling clusters are given by v023. This survey and other exceptions appear in the following file (attached below).

If you combine surveys, such as all the NG surveys, you do need to construct unique identifiers for combinations of cluster x survey and strata x survey. You can do this with egen group, as has been described in other forum posts. Note that even though the strata may be defined in the same way in the surveys that are being pooled, you do need unique identifiers because the populations are different.

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