I just began working with the 2012 5 year PUMS State of California. There is one variable for PUMA. Any thing before 2012 has the 2000 PUMA and 2012 has the “2012” PUMA. For the 2012 data the first 2 digits refer to the County. Pre 2012 is not like that. And there is no longer a county variable.
Pulling county data out of the state file is impossible, unless I know all of the 2000 PUMAs in the county.
Doing PUMA analysis on the 5 year data is impossible, because there is an imperfect relationship between 2000 and 2012 PUMAs.
Am I right in my assumptions, or am I missing something?