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METADATA :: Sample characteristics :: United Kingdom (1991 2001 Selected All )

Census Characteristics	1991	2001
Title	1991 Census	2001 Census
Census Agency	Office of Population Censuses and Surveys	Office of Population Censuses and Surveys
Population	Every person who spends census night (21-22 April) in the household, including anyone staying temporally; 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.	Anyone who is temporaly away from home on the night of 28 April 2001 who usually lives at this address. Any baby born before 30 April 2001, even if still 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.
Universe
De jure or de facto	De jure	De jure
Enumeration unit	Occupied private dwellings and communal establisments	Occupied dwellings and communal establisments
Census day	April 21, 1991	April 29, 2001
Field work period	-	-
Enumeration forms used	Form for private households (H), Form for making and individual return (I), and Form for communal establisments, HM Ships or other vessels (L)	England household form (H1)
Type of field work	Self-enumertation	Self-enumeration
Respondent	The head or Joint Heads or members of the household aged 16 or over	The head of Joint Heads or members of the households aged 16 or over
Coverage	2 % of the population of Great Britain missed entirelly and a further 1,6 per cent for whom records	No official estimates
Microdata sample characteristics	1991	2001
Sample microdata source	Office of Population Censuses and Surveys. Constructed from fully-coded household and communal estab	Office of Population Censuses and Surverys. The 2001 SARs were sampled from the One Number Census da
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 were stratified into groups of nine, and two individuals selected from each group at random. Individuals in communal establisments 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. NOTE 2: Many data items are not available for households with 12 or more persons, for confidentiality reasons. These cases are code "not in universe" in the affected variables	The sampling scheme for the household SAR (Sampler of anonymised records) is a stratified random sampling, where the strata are EDs (Enumeration districts). Unlike 1991, there is no stratification within EDs. 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 unit	Dwelling	Dwelling
Sample fraction	2 %	3 %
Sample fraction (private households)
Sample fraction (institutional households)
Sample size (person records)	541.894	1.843.525
Sample size (private households)
Sample size (institutional households)
Sample weights	Weights computed by census agency	Weights computed by census agency
Units identified	1991	2001
Dwellings	No	No
Vacant units	No	No
Households	Yes	No
Individuals	Yes	Yes
Group quarters	Yes	Yes
Settled/unsettled Population
Special populations	-	Yes
Unit definitions	1991	2001
Dwellings	-	-
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 temporaly with the household are included	A household comprises either one person living alone or a group of people not necessarily retaled, 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.
Institutional population
Group quarters	-
Unsettled population