On the 1990 census sf3 variable call, two time frames (20 to 24 and 35 to 39) are missing from "travel time to work". The variable codes increment from P0500001 (TRAVEL TIME Less than 5 minutes) to P0500013 (TRAVEL TIME Worked at home), with P0500005 and P0500008 missing - presumably the missing time frame variables. Using these in the data call results in an 'unknown variable' error.
Is this a bug and the data is missing or did I somehow drop the proper variable codes?
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