Hello Nina,
Both options are correct, and the choice depends on which sample you want to represent. Weights ending in “ui” combine the GPS (General Population Sample), EMBS (Ethnic Minority Boost), BHPS (British Household Panel Study), and IEMBS (Immigrant and Ethnic Minority Boost) samples. In contrast, weights ending in “ub” combine the GPS, EMBS, and BHPS samples only.
In addition, weights ending in “px” include proxy interviews, whereas those ending in “in” include main interviews only, and “sc” refers to self-completion interviews. Again, the appropriate choice depends on the type of individual-level analysis you are doing.
If you aim to maximise sample size, you may use f_indpxui_xw, as it includes all samples and both main and proxy interviews.
I hope this information is helpful.
Best wishes,
Roberto Cavazos
Understanding Society User Support Team
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