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- where the number of strata is very high, Eurostat exceptionally computes the variance by regions and not by country. For 2020, this was the case for EL. This assumes that strata are nested into regions.
- where the data do not have the PSU_* field completed, Eurostat removes the option "Cluster" from the proc surveymeans procedure. This was the case for 2020 for all countries.
- proc surveymeans excludes countries and strata that have all weights equal to 1 for all holdings. However, countries and strata that have all weights equal to 1 will eventually get CVSUM of 0 or null. proc surveymeans computes SE and then CVSUM is computed from SE; CVSUM must not be taken from proc surveymeans, since in the case of exclusion of strata with weights 1, the calculated SE is correct, but the VALUE(SUM) and consequently CVSUM is not correct. CVSUM must be calculated outside the proc surveymeans procedure by dividing SE and VALUE(SUM).
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