| Census characteristics |
| |
1991 |
2001 |
| Title |
1991 Census |
2001 Census |
| Census agency |
Centre for Census and Survey Research |
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. |
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 facto and de jure |
De jure |
| Enumeration unit |
Occupied private dwellings and communal establishments |
Occupied dwellings and communal establishments |
| Census day |
April 21, 1991 |
April 29, 2001 |
| Field work period |
— |
— |
| Enumeration forms |
Form for private households (H), Form for making and individual return (I), and Form for communal establishments, HM Ships or other vessels (L) |
England household form (H1) |
| Type of field work |
Self-enumeration |
Self-enumeration |
| Respondent |
The head or Joint Heads or members of the household aged 16 or over |
The head or Joint Heads or members of the household aged 16 or over |
| Undercount |
2.0% of the population of Great Britain missed entirely and a further 1.6 per cent for whom records were imputed. |
No official estimates |
| Microdata sample characteristics |
| |
1991 |
2001 |
| Microdata source |
Office of Population Censuses and Surveys. Constructed from fully-coded household and communal establishments forms. |
Office of Population Censuses and Surveys. The 2001 SARs were sampled from the One Number Census database for the entire UK. |
| 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. |
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 unit |
Dwelling |
Dwelling |
| Sample fraction |
2.0% |
3.0% |
| Sample size (person records) |
541,894 |
1,843,525 |
| Sample weights |
Weights computed by census agency. |
Weights computed by census agency. |
