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st: svy: mean - # of observations and missing SEs
I'm computing means using svy: mean and I'm puzzled by two things:
1. The number of observations reported with the summary statistics is
generally smaller than the number of observations in my sample (or
subsample). This is the case even when I know the data on the variables to
be summarized are complete for these observations.
2. For some sub-populations I get the following error message:
Note: Missing standard error due to stratum with single sampling unit; see
So I omit the observations which are singletons within a stratum. But I
continue to get the same error. The error disappears when I drop some of
the variables to be summarized.
Can anyone shed light on this?
Thanks for your help,
Applied Economics and Management
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