If the occupation code sometimes represents different timeframes (dominant lifetime, current, most recent), reliability can be improved by changing the codes applied.

• A. True
• B. False
• C. Not enough information
• D. Sometimes

Answer: (B)

Reliability in coding comes from having clear, uniform rules for how data are assigned. When an occupation code can refer to different timeframes—like dominant lifetime, current, or most recent—the same person could be coded under different meanings in different records. That ambiguity creates measurement error and lowers reliability, because the code doesn’t carry a consistent meaning across cases.

Changing the codes you apply won’t by itself fix that. If you don’t standardize which timeframe is used and how to handle edge cases, you’ll simply swap one source of inconsistency for another. The way to improve reliability is to set a single, explicit timeframe (for example, current occupation), develop a detailed coding manual, train coders, and regularly check for agreement between coders. With those standardizations in place, the data become more consistent and reliable.