One Number Census
The results from the 2001 census were produced using a methodology known as the One Number Census. This was an attempt to adjust the census counts and impute answers to allow for estimated under-enumeration measured by the Census Coverage Survey (sample size 320,000 households), resulting in a single set of population estimates.
Read more about this topic: United Kingdom Census 2001
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“The said truth is that it is the greatest happiness of the greatest number that is the measure of right and wrong.”
—Jeremy Bentham (1748–1832)