| Re: How to treat missing data in analysis [message #24981 is a reply to message #24953] |
Fri, 12 August 2022 16:51  |
Janet-DHS
Messages: 938
Registered: April 2022
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Senior Member |
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Following is a response from DHS Research & Data Analysis Director, Tom Pullum:
By "missing" you are probably referring to a dot in Stata ("."), which is equivalent to a blank, and is the Not Applicable (NA) code. It means the question or variable did not apply to the case. If you go back to the questionnaire and find the question for "can get a condom" I expect you will find that it is preceded by filters and skips such that the question is only asked of some subpopulation of women. For other women, the question is not asked and is coded with a dot for NA.
Sometimes in DHS data files you will find a code "9" or "99" etc. that is not included in the label for the variable. When you find these codes, you will probably want to drop the case from a tabulation or calculation of a mean, etc., but they are actually very rare.
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