Can you explain the rules for assigning unmarried partners to either a subfamily (subfam>0) or not in a subfamily (subfam==0)? For example, in the 2016 ACS sample, there are 8,159 unmarried partners. 4,140 are in a subfamily (defined by subfam variable) and 4,019 are not in a subfamily. I’ve read through the subfamilies overview, and I still can’t seem to piece this together.
Thanks in advance for your time and assistance!