1. Census.ac.uk SARs 2011

2. Census.ac.uk Where we are Phase 1: SARs user meeting 12 November 2007 consultation survey with users/non-users in 2007. Phase 2: SARs user meeting 23 April 2009 – Business Case by Keith Dugmore on the demand for the 2011 Census. – We proposed the 5 files/first document outlining the principles underlying the strategy for 2011 census microdata presented to the ONS Phase 3: SARs user meeting 28 Jan 2011 Produced file specifications and made available online Consultation October 2010-Jan 2011. Summary of consultations now online Final consultation and feedback today!

3. Census.ac.uk Key Feature of the 2011 SARs Coverage Size Ethnicity and religion Geography Multivariate Household structure Comparability with other census products Easy access

4. Census.ac.uk Importance of features 2011

5. Census.ac.uk Issues around data access 0 10 20 30 40 50 60 70 Per cent routine exceptional no work in instit- ution institut- ion safe setting analy- ses checked month long applic- ation travel away Microdata research facilities survey 2009 n(u) = 197 Microdata users only Limited detail in EUL files Institutions have appropriate facilities Biggest obstacle is long waits Travelling and having analyses checked also unpopular Past CAM VML use is low CAM users had mixed experiences

6. Census.ac.uk Recommendation of the Business Case Two popular files: for quick queries, education, and to attract new users Two professional files: offering more detail, but requiring more security Microdata Laboratory Facilities: offering considerable detail, but access only under strictest security con Production file: 15% household file – other files derived from mothership

7. Census.ac.uk Access for 2011 SAR data Legal protection for personal data Statistics Act establishes Approved Research Status High level spec assumed 3 levels of security ONS policy distinguishes 4 levels of data (impact level) –Public use (0) –Licensed (1) –Contracted(2) –Identified (3) Secure Data Service is key for Approved Research Files Balancing access against detail

8. Census.ac.uk Statistical Disclosure and microdata policy Level of SDC on the source data (protection via record swapping?) Extra protection from sampling, imputation (item and non-response), churning (with time),, variable coding, large households? SARs disclosure risk depends on other outputs (need to be considered in tandem) Outputs policy in each country Different levels of SDC depending on access Special licences phased out? Secure Data Service (SDS) Virtual Microdata Lab (VML)

9. Census.ac.uk 2011 Specifications File Sample type GeographySimilar toImpact level Access 1a General Regional File 3% indivi. Region2001 Individual Licensed SAR 1 licensce d EUL, available from CCSR 1b Local Authority File (EUL) 5% indivi. Region2001 Small Area Microdata file 1EUL, available from CCSR 2a Individual File 3% indivi. LAD/ UA/Metropolitan District/London Borough/ Parliamentary Constituencies (NI) 1991 Individual SARs, but with enhanced features 2 contrac ted Approved Researcher SDS? 2b Household File 1% hierar- chal file None2001 Special License Household file. 2 Approved Researcher SDS? 3. Controlled Access Microdata file. Approx 15% HH LAD/ UA/Metropolitan District/London Borough/ Parliamentary Constituencies (NI) Facility to match small area indicators? 2001 CAMS files. 2 Approved Researcher VML or SDS?

10. Census.ac.uk Summary of the consultation on the variables for 2011 The specifications for the 5 files became available on the SARs web page in Sep 2010: –Expert consultation in Sep. and open consultation in Dec 2010. –Most comments made by invited expert users, but also some substantial comments by other users. –A total of 30 users commented on the variable specifications for the different files Types of comments and actions required by the SARs team: –Comments that required simple modifications- some of which have been adopted –Comments that needed further consultation and deliberation or depend on sdc trade-offs between access/detail/other variables (some of these may be discussed here) –Comments which are affected by circumstances beyond our control (e.g relating to the structure of the census questions)

11. Census.ac.uk EUL LA file COB Country of birth (6 cat.)COB AGE Age of individual (0-89 singly, 90+ banded)AGE MARSTAT - Marital status (4 cat.)MARSTAT DPCHUK11 - Household dependent children (not available)DPCHUK11 BUSINESS Industry of employment (27 cat.)BUSINESS ISCO International Standard Classification of Occupations (9 cat)ISCO MAINLANG Main language (2 cat)MAINLANG ETHNICITY(NI) (2 cat.)ETHNICITY(NI) ETHNICITY (E&W) (18 cat)ETHNICITY (E&W)

12. Census.ac.uk EUL Individual File COB Country of birth: 16 cat.COB DPCHUK11 Household dependent children (19 cat)DPCHUK11 BUSINESS Industry of employment (17 cat.)BUSINESS DTWPEWNI11 Distance travelled to work (10 cat)DTWPEWNI11 YRARR Year of arrival in UK (14 cat.)YRARR QUALVEWN Level of highest qualifications (6 cat.)QUALVEWN

13. Census.ac.uk Approved Individual File COB Country of birth (49 cat)COB DTWPEWNI11 Distance travelled to work (0.1- 9999.9 km in 0.1 km units)DTWPEWNI11 YRARR Year of arrival in UK (Banded in 4 cat. Until 1970, 1980+ in single years)YRARR IDENTITY National identity (49 cat)IDENTITY ETHNICITY (E&W) (18 cat)ETHNICITY (E&W) CITIZENSHIP Passports held (7 cat)CITIZENSHIP MAINLANG Main language (16 cat)MAINLANG RELIGION(E&W) Religion (7 cat)RELIGION(E&W)

14. Census.ac.uk Approved Household LARPUK11 Living arrangements (11 cat)LARPUK11 BUSINESS Industry of employment (98 cat)BUSINESS ISCO International Standard Classification of Occupations (Full classification)ISCO MOVEFROM Address 1 year ago. (Banded distance, 18 cat.)MOVEFROM ETHNICITY (E&W) (18 cat)ETHNICITY (E&W)

15. Census.ac.uk CAMS BUSINESS Industry of employment (98 cat.)BUSINESS ISCO International Standard Classification of Occupations (Full classification)ISCO LAWRK Local Authority District/ Unitary Authorities /MD /London Borough/ Parliamentary Constituencies (NI) of Workplace (not available on EUL files)LAWRK COB Country of birth: Full country classificationsCOB