Dear IPUMS team,

I am descriptively examining changes in totals and proportion of social work occupations (defined by using social worker and counselor occupation codes) over the last 40 years. I applied the Strata and Cluster codes to adjust variance estimation and the person weight (PERWT) for the point estimates. I use Stata and applied the following code for the survey design: svyset cluster [pweight=perwt], strata(strata)

However, when I run the analysis, such as “svy: total” or “svy:mean,” it fails to estimate the variance (picture below). It says, " Missing standard error because of stratum with single sampling unit." For your information, I used the full dataset, not selecting or deleting certain cases.

Is the problem related to the fact that the Strata and Cluster variables are constructed at the household level while my analysis focuses on the person level?

Thank you very much for your help!

Warm regards,

Hyojin