Understanding Society User Support

Hello Alexey,

Universe of xwavedat is all sample members who have ever been enumerated in any household in the BHPS or UKHLS samples
Universe of xwaveid includes only the UKHLS sample members+BHPS sample members who have been enumerated at least once as part of the UKHLS waves. So, the difference in the universe of these two files, are the sample members who were only enumerated as part of the BHPS 18 waves.

Hope this helps.

Alita
Understanding Society User Support Team