Understanding Society User Support

Luca,

Thank you for your question.
If you are interested in estimates in a particular time point - you should use cross-sectional weights. In other words if you estimate the same model for each wave separately and you include only information from that particular wave in the model - you should use the cross-sectional weight from that wave.
If you are using information from across a few waves - you should use a longitudinal weight from the last wave in your analysis.
The change in definition at wave 6 relates to immigrants: from wave 6 'ui' weights include immigrants since 2009 but 'ub' weights don't include them. This is only relevant if you put together many cross-sectional estimates and compare them over time (e.g. looking at a trend). This does not influence longitudinal analysis. If you want to be sure to have comparable cross-sectional estimates (i.e. those that exclude immigrants since 2009) then you can use 'ub' weights throughout.

Hope this helps,
Olena

Dear Olena,

Many thanks for replying so quickly. That's very helpful. If I understand correctly, since I am using information from across a few waves, I can apply the "indinub_lw" weight. Is this correct?

Thanks and best wishes,
Luca

Luca,

Yes, the weight is correct, and it should come from the last wave that you use in your analysis. Note, 'ub_lw' weight is available for analysis from wave 2 onwards.

Olena

Dear Olena,

Sounds good. Many thanks again.

Luca