I have a question on LDA sample (low density area non-white background sample). I found many extra 5 min questions were asked to LDA sample as well (condition in codebook was "GRIDVARIABLES.LDA = 1". However, I could not find an explanation on (i) sample size/how they were collected in the most recent User guide. Also, (ii) I could not find an identifier variable in the published dataset whether the respondent was drawn from LDA sample.
Could you please provide me more explanations on (i) and (ii)?
Thanks a lot,