In the CPS-ASEC, OI-OFF is a variable for Other Income, where 1=Social Security, 2=private pensions, 3=AFDC, et cetera up to 19 possible other income sources. OI-VAL is the corresponding $ value.
The CPS also has Social Security variables SS-YN and SS_VAL.
My questions are:
(1) What is the difference between SS-YN and OI-OFF=1? Do these variables include different forms of payment, eg. monthly benefits vs. lump sums? Is there potentially some overlap between these variables?
(2) Do respondents give a single answer to OI-OFF, or can they give multiple answers (eg., OI-OFF=1 for Social Security and also OI-OFF=5 for interest income)? If multiple answers are allowed, how is OI-VAL interpreted?