In the HOURAGE documentation, there is this doozy:
The Census Bureau reports that the results in the CPS public use files for this data series included errors for years prior to 1990, so only data from 1990 forward are part of IPUMS-CPS.
Where does the Census Bureau report this?
More broadly: how big are the errors? Because I’ve come across many papers that use the May/ORG data going back well before 1990. And the NBER’s MORG dataset goes back to 1979. Presumably IPUMS discussed the option of including HOURWAGE going back further in time along with a warning, and decided elision was the better option - I’d just like to understand why.