| Tanzania 2010 [message #3101] |
Wed, 15 October 2014 13:56  |
azucena2014
Messages: 5
Registered: August 2014
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I am using the Tanzania 2010 DHS and am trying to use the survey commands in Stata. So, I use the commands I usually use when I want to apply the survey settings in Stata with DHS data:
gen weight=hv005/1000000
svyset hv021 [pweight=weight], strata(hv022)
However, when I try to anything that require a test statistic, I get the following message:
"Note: Missing test statistics because of stratum with single sampling unit."
Any help is greatly appreciated
EAS
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| Re: Tanzania 2010 [message #3113 is a reply to message #3112] |
Thu, 16 October 2014 10:56  |
azucena2014
Messages: 5
Registered: August 2014
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Member |
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Thanks, but I just tried this and got the same message (Note: Missing test statistics because of stratum with single sampling unit) when I tried the following:
svy, subpop(age059): tab stunting depndgtr1, col obs
I am running a similar analysis on various countries and this is the first time I have encountered this problem
EAS
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| Re: Tanzania 2010 [message #3115 is a reply to message #3113] |
Thu, 16 October 2014 22:24 |
Reduced-For(u)m
Messages: 292
Registered: March 2013
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Senior Member |
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What happens if you tabulate (list) the strata? Is there one strata value that is a typo or "missing" or something? It sounds like you might have a rogue strata in there, and if you find it you could just drop that observation. Let me know if that works.
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| Re: Tanzania 2010 [message #3117 is a reply to message #3113] |
Thu, 16 October 2014 22:47 |
azucena2014
Messages: 5
Registered: August 2014
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Member |
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Yes, I had already tried that and everything looks normal. I also did a cross-tab of hv021 and hv022 to see if there was something there that was odd but that also all looked normal, too. I downloaded this data 3 days ago. Any other ideas? I need to be able to report the test statistics
EAS
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| Re: Tanzania 2010 [message #3125 is a reply to message #3101] |
Sat, 18 October 2014 14:39 |
Trevor-DHS
Messages: 805
Registered: January 2013
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Senior Member |
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The problem is that in certain strata there is only one cluster, and for the calculation of sampling errors and confidence intervals at least two clusters are required in each cluster. In this case the best thing is to regroup the strata to permit the calculation of the sampling errors. In the case of this Tanzania dataset, the following have only one cluster:
18: Kagera, urban
22: Kusini Pemba, urban
23: Kaskazini Pemba, urban
I suggest grouping these with the rural strata for the same regions, e.g. with
44: Kagera, rural
48: Kusini Pemba, rural
49: Kaskazini Pemba, rural
Thus I suggest using the following:
recode hv022 (18=44) (22=48) (23=49), gen(strata_new)
svyset hv021 [pw=hv005], strata(strata_new)
As you are using a subpop with your tabulation, you may hit this issue with other strata, in which case you will need to make a decision to regroup further strata together.
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