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Sample characteristics: United Kingdom

Census/survey characteristics
Type Census
Title 1991 Census
Statistical agency Centre for Census and Survey Research
Population universe Every person who spends census night (21-22 April) in the household, including anyone staying temporarily; any other people who are usually members of the household but on the census night are absent on holiday, at school or college, or for any other reason even if they are being included on another census form elsewhere; anyone who arrives here on Monday 22nd April who was in Great Britain on the Sunday and who has not been included as present on another census form; and any newly born baby born before the 22nd April, even if still in hospital.
De jure or de facto De jure and de facto
Census/survey day April 21, 1991
Questionnaire Form for private households (H), Form for making and individual return (I), and Form for communal establishments, HM Ships or other vessels (L)
Type of fieldwork Self-enumeration
Estimated undercount 2.0% of the population of Great Britain missed entirely and a further 1.6 per cent for whom records were imputed.
Microdata sample characteristics
Sample design All fully-coded household forms were ordered geographically with the lowest level the enumeration area. Households were then grouped into batches of 10 and one household selected at random from each batch. The two per cent Individual sample was then drawn from the remaining households. Individuals in the remaining households were stratified into groups of nine, and two individuals selected from each group at random. Individuals in communal establishments were stratified into groups of five and one individual selected at random from each group. NOTE: The sample excludes Northern Ireland. It includes England, Scotland and Wales. NOTE2: Many data items are not available for households with 12 or more persons, for confidentiality reasons. These cases are coded "not in universe" in the affected variables.
Sample fraction 2%
Sample size (person records) 541,894
Sample weights Weights computed by census agency.
Units identified in microdata
Dwellings No
Vacant units No
Households Yes
Collective dwellings Yes
Smallest geography SARs region
Unit definitions
Households A household comprises either one person living alone or a group of people not necessarily related, living at the same address with common housekeeping - that is, sharing at least one meal a day or sharing a living room or sitting room. People staying temporarily with the household are included.
Census/survey characteristics
Type Census
Title 2001 Census
Statistical agency Centre for Census and Survey Research
Population universe Anyone who is temporarily away from home on the night of 29 April 2001 who usually lives at this address. Any baby born before 30 April 2001, even if sitll in hospital. People with more than one address if they live at this address for the majority of the time. Anyone who is staying with no other usual address. A spouse or partners who works away from home, or is a member of the armed forces, and usually lives at this address.
De jure or de facto De jure
Census/survey day April 29, 2001
Questionnaire England household form (H1)
Type of fieldwork Self-enumeration
Estimated undercount No official estimates
Microdata sample characteristics
Sample design The sampling scheme for the household SAR (Sample of anonymised records) is a stratified simple random sampling, where the strata are EDs (Enumeration districts). Unlike 1991, there is no stratification within EDs. Random sampling is applied within each ED. The sampling scheme for the individual SAR follows the 1991 approach of drawing from the population excluding the household sample. Stratification is again by ED. The Individual SAR sampled both private and communal persons, unlike the household SAR which only sampled only households.
Sample fraction 3%
Sample size (person records) 1,843,525
Sample weights Weights computed by census agency.
Units identified in microdata
Dwellings No
Vacant units No
Households No
Collective dwellings Yes
Smallest geography SARs region
Unit definitions
Households A household comprises either one person living alone or a group of people not necessarily related, living at the same address with common housekeeping - that is, sharing at least one meal a day or sharing a living room or sitting room.