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This paper provides a brief assessment of the quality of the data obtained from the Income question in the 1991 Census (Q.29). It should ensure users have a basic appreciation of the limitations of the data. The quality of the data was evaluated by considering intercensal changes, including non-response rates, and comparison with the 1990 Survey of Income and Housing Costs and Amenities. In addition, the changes to the question design implemented in the 1996 Census are described because they deal with a number of issues identified as data quality problems in the 1991 Census.
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