Understanding Society User Support

Ioannis,

Thank you for your question. The data structure within one wave is PSU, household, person, and in a longitudinal context it is psu, person, time-point observation.
We use implicit stratification. Depending on statistical model, sometimes they can't account for stratification. Stratification gains statistical efficiency, hence making your CIs smaller. But if the model can't take them into account your results will still be valid, but conservative.

Hope this helps,
Olena

Hi again,

I use a Bayesian model so I can include them as random effects, so I can include the PSU as a random effect, and also the STRATA as another random effect. But the STRATA is a finner or coarser representation of the data compared to PSU? From my understanding it is a coarser.

Best,
Ioannis

Strata is not nested within PSUs. It is also not used as clustering in the design. Of course you could define your clusters based on strata information, if you wish, if your research design aligns with the definition of our stratification, but more likely you would use other variables for this. In such situation you may need a cross-classified modelling.

Hope this helps,
Olena