EGM – Population & Housing Censuses Eurostat / UNECE - Geneva - 24/25 May 2012 Building the address register for the 2011 Census (England & Wales)

EGM – Population & Housing CensusesEurostat / UNECE - Geneva - 24/25 May 2012

Building the address register for the 2011 Census (England & Wales)

Alistair Calder – Office for National Statistics

• Role of addresses in Census 2011• Match• Field check• Evidence base & rules• Summary

Address Register for 2011

THE CENSUS FIELD OPERATION

PostOut

Special& CEs

PostBack

InternetBack

CCS

FollowUp

Enforce-ment

QuestionnaireTracking

MATCH& check

etc

ADDRESSREGISTER

THE CENSUS FIELD OPERATION

PostOut

PostBack

FollowUp

InternetBack

Special& CEs

MATCH& check

etc

ADDRESSREGISTER

Enforce-ment

CCS

QuestionnaireTracking

Addresses

Why so important for 2011?

• Post-out to deliver 95% of questionnaires• At the centre of questionnaire tracking

– focus effort on non response– target follow-up resources more effectively

• Key source for use in QA of census estimates– Address frame feeds in to estimation

Address Register for 2011AimsTo create:• best possible register of households from

available sources and fieldwork• a register that stakeholders were confident in• a register that is best value for money

> 99% complete <1% duplication

A list designed specifically for Census

So what’s the problem ?just use the national address list !

PostcodeAddress

FilePAF Valuation

Office

National Land& PropertyGazetteerNLPG

AddressLayer 2AL2

LLPGs

LLPGs

x 348

CouncilTax

TVLicense

Utilities

Emerg.Services

etc

PAF& AL2

NLPG

PAF

NLPG

95%???

PAF

NLPG

95%??? ?

new

CEs

Three main streams of work Match and validate• Match of 3 national address files

• Royal Mail – PAF (& Ordnance Survey – AL2)

• Local Government Information House - NLPG

• (and VOA data)

• Unresolved address anomalies sent to suppliers and Local Authorities (LAs)

• ONS field checks 15% of E&W

Targeting the Address Checkfinding the suspect addresses

Where to check ??

Electricity - Multiple meters

Electoral register - Multiple names

• Anomalies between sources (10%) - proxy for address complexity

• Multiple meters / Multiple names from electoral role within addresses (4%)

– proxy for complex structures +

• Stratified random sample (1%)

Criteria for checking

The Evidence Baseand evidence codes

Evidence base …..

Evidence IA RM F LA 3rd ?

9 High Street 1L 1F 1R 1L 1L1G

10 High Street 0C 1F 1R 0C 1L1G

11 High Street 0S 1F 0X 1L 1L0X

11a High Street 0X 1F 0X 0X 0X0X

11b High Street 0X 1F 0X 0X 1D0X

Flat 1/11 High Street 1L 0X 1R 1L 0X1G


Evidence base …..









Evidence base …..









Evidence base …..









Evidence base …..









Keep the data up-to-date !• Constantly match in Change• Pick up change late

Research, Data Cleaning & Other Sources

• Clerical processes Desktop comparison, GIS, Internet, Aerial photography

• Other Sources Vacant houses, electoral register, utility meters

Three main streams of work

Royal Mail vs. ONS Address CheckNon-Residential vs. ResidentialFlats above shops, Complex addresses

221 Cannock Road, Cannock, WS11 5DDRecommendation: send a questionnaire

Royal Mail vs. ONS Address CheckNon-Residential vs. ResidentialFlats above shops, Complex addresses

221 Cannock Road, Cannock, WS11 5DDRecommendation: send a questionnaire

Communal Establishments

• Strong prioritisationPopulationIndividual size of units (so local relevance)Target populations (hard to count)

• Split of typesComplex – Universities, prisons (100% field)Standard – Hospitals, hostels etc (100% field)Simple – Hotels, B&Bs care homes (phone)

• Targeted field check• Used local input / QA

Communals

• New approach to Census • Building the address register

• Matching several datasets• Targeted checking in field• Use of evidence base and rules

• Communal establishments• Dealt with separately• Students done differently

• Result – considered highly successful• Hit targets for over and under coverage

Summary

EGM – Population & Housing Censuses Eurostat / UNECE - Geneva - 24/25 May 2012 Building the address register for the 2011 Census (England & Wales)

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