2001 Information

**This information has been copied across from the SCROL website and some of it may be out-of-date. This will be updated in due course**

Introduction to 2001 census

This supporting information has been compiled to help users understand and make effective use of the results of the 2001 Census in Scotland.

This is version 2 of the Supporting Information and these pages will be updated to take account of additional information as it becomes available, such as levels of edit and imputation, or to take account of changes to the output, such as footnotes in the output tables. The latest version of the Supporting Information will be available on the Census pages of the NRS website (http://www.NRScotland.gov.uk). For further details Contact Us.

The information is subdivided into a number of topics, which you can navigate using the section headings on the left. At the top of each section page are further links which enable you to access summary information within each section. Alternatively you can use the search function to help you quickly locate the information you are seeking; this is especially helpful if you are seeking information on a particular Census variable or topic.

Census Background 

This section of the Supporting Information describes the process of consultation and legislation that determined the questions that were asked in the Census and the shape of the results. There is a description of the fieldwork required to deliver the Census forms and get them back by post or collection. There is a list of the questions on the form and a description of how the forms were processed. The section concludes with a comparison of how undercoverage was dealt with in 1991 and 2001, and statements about data quality and confidentiality.

Communal Establishments

This section describes how communal establishments and the people who lived in them were dealt with in the census. There is an account of the treatment of persons sleeping rough.

Population Bases

This section describes the residential population base, and how the treatment of students and schoolchildren differed from 1991.

One Number Census

The One Number Census (ONC) project integrates the 2001 Census counts with the estimated under-enumeration so that all census outputs add to one number - the national population estimate, which has been adjusted for under-enumeration. The primary source in estimating the under-enumeration was the Census Coverage Survey (CCS).

Edit and Imputation

Further information on edit and imputation strategy employed by NRS to estimate missing data and resolving inconsistencies in responses.

Disclosure Control

The Registrar General has a legal obligation not to reveal information collected in confidence in the Census about individual people and households. Protecting the Census data is of key importance and this section details the steps that have been taken to safeguard confidentiality and protect against disclosure of personal information provided on the Census form.


Census results are available for a wide range of Census areas and this section provides some background on these areas and how they are defined.


This section provides information on the range of products that are available from the 2001 Census in Scotland and guidance on where to obtain more information or advice on the most appropriate products for your needs.


This section provides important information about the classifications used in the 2001 Census. It covers: differences between parts of the UK; comparability with the 1991 Census; variable definitions; data classifications; and standard derived variables.