Conference Programme Introduction to the Samples of Anonymised Records - Keith Spicer, ONS CCSR's role in providing SAR's support - Jo Wathan, CCSR 11.00Refreshments 11.20Dynamics and Diversity: Ethnic Employment Differences in England and Wales - Stephen Drinkwater, University of Surrey 11.45Household membership, ethnic group and subnational geography - Abdelouahid Tajar, CCSR 12.10Using the 2001 Census Microdata for Evidence Based Policy- Making - Chris Gardiner and Lisa Buckner, Sheffield Hallam University 12.35Discussion, followed by Lunch at 12:45.

Conference Programme 13.30Migration in 2001 Census - Tony Champion, University of Newcastle 14.00The drivers of individual migration: an analysis of individual data from the 2001 Census - Nick Bailey and Mark Livingston, University of Glasgow 14.30Discussion 14.45Refreshments 15.00Access to the Controlled Access Microdata Sample (CAMS) - Michelle Clift-Matthews, ONS 15.15Discussion on lessons learnt and approach for 2011 Census Microdata – Panel session 16.00Close

Introduction to Samples of Anonymised Records (SARs) Keith Spicer – ONS SARs User Group Meeting 15 July

Samples of Anonymised Records (SARs) Data sets of Census microdata (individual and household records) 1991 OPCS provided 2% individual SAR and 1% household SAR 2001 ONS provided 3% individual SAR, covering UK, and shortly 1% household SAR – and to cover smaller areas (less detail) a 5% dataset including LA geography

Confidentiality Pledge to respondents on Census form National Statistics Code of Practice: ……a guarantee that no statistics will be produced that are likely to identify an individual..… - Impact on what we provide and how we provide it - Protection against disclosure by two means -making data safe -safe setting

Confidentiality – making data safe Measure of risk: –Proportion of sample cases that are unique in the population, based on a few selected variables Benchmark for safe data where 1% of sample are population uniques Achieved by recoding and data perturbation

Confidentiality – safe setting Used for data with more detail (disclosive) ONS data laboratories Researchers application Outputs and publications checked by ONS

SARs Products 3% sample of individuals, access through CCSR (Individual Licensed SAR) 3% sample of individuals, controlled access microdata sample (CAMS) – in-house SARs 1% sample of households – CAMS 1% sample of households, access under special licence through UK Data Archive 5% sample of Small Area Microdata (SAM)

Balance between Risk and Data Utility Non-disclosive Disclosive Individual Licensed SAR CAMS Household SAR (Special Licence)

Progress and Achievements Individual Licensed SAR Version 2 released in April –Religion –Full ethnic group –81 instead of 25 occupational categories –COB categories expanded from 7 to 16

Progress and Achievements Controlled Access Microdata (CAMS) Opportunities to provide more detailed datasets Data lab in Titchfield – and other sites Individual CAMS Household CAMS Additional responsibilities of researchers Lab used for 14 different research applications so far (4 pending)

Progress and Achievements Household SAR 1% population uniques not achievable without seriously damaging data utility Recognised need to provide useful file for desktop access Combination of data protection and access conditions Some protection to data (recoding and light perturbation) Proposed access through ONS Special Licence

Household SAR – Special Licence Will be available through UK Data Archive Applications scrutinised carefully by ONS –Professional researcher with institutional support –Purpose for statistical research only –Intention to publish, and research of value to the field High level of responsibility and trust of researchers Sanctions for institutions where users contravene licence conditions

Still to do……. Household SAR under Special Licence –August 2005 Small Area Microdata –September/October 2005

More Information - CCSRs SARs website CAMS User Guide – also see our website for Confidentiality Guidelines and other SARs details