BHPS sample members without pids in Understanding Society
I am working on the attrition in BHPS and UKHLS.
I realised some cases in UKHLS (around 400 in each wave) comes from BHPS sample but do not have pids. I checked xwavedat (UKHLS) data to see if the pids are present there (so I would match pids using pidps from this file), but the same cases do not have pid in xwavedat either.
I thought everybody (even if they were under 16, or never interviewed) would have a pid.
Can you please explain, if I am doing something wrong? Is there any people in BHPS sample with missing pids in UKHLS waves?