There's a curious difference between two income variables in CCHS 2.1; according to the codebook, for the total household income
INCCGHH=1 represents 'NO INCOME AND LESS THAN $15,000',
whereas for the personal income variable
INCCGPER=1 represents 'NO INCOME' and
INCCGPER=2 represents 'LESS THAN $15,000'
A student currently using the PUMF was wondering why one had the two categories collapsed into one, but the other, not.
The reason provided by the division was indeed for confidentiality reasons.