cids
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Census interaction data: from CIDS to CIDER John Stillwell School of Geography, University of Leeds, CIDS Director and UPTAP Coordinator. - PowerPoint PPT PresentationTRANSCRIPT
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Census interaction data: Census interaction data: from CIDS to CIDERfrom CIDS to CIDER
John Stillwell
School of Geography, University of Leeds, CIDS Director and UPTAP Coordinator
Third International Conference on Population Geographies organised by the RGS-IBG Population Geography
Research Group at the University of Liverpool, 19-21 June 2006
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CIDSCIDS
• Census Interaction Data Service • ESRC/JISC funded Data Support Unit under the
Census Programme 2001-2006-2011• Provides registered users throughout the UK
with access to census origin-destination migration and commuting statistics
• Overall aim is to encourage more use to be made of these data sets
• Web-based Interface to Census Interaction Data (WICID) is the online access system
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PresentationPresentation
1 IntroductionCensus interaction dataDevelopments from 1991CIDS data holdings
2 WICID: How does it work?Building queriesAnalysis tools
3 From CIDS to CIDERCIDS useageCIDER objectives
4 UPTAPOverview
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1 Introduction:1 Introduction:Census interaction dataCensus interaction data
• SMS/SWS/STS involve migration and commuting flow data involving two geographies: origins and destinations
• Extremely rich data sets for use by researchers and practitioners
• Especially valuable because of lack of alternative data sources, especially below district scale
• Territorially comprehensive and reasonably reliable
• Tell us many things about mobility patterns, place connectivity and behavioural processes
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Example:Example: Patterns of net migration for London Patterns of net migration for London boroughs, 2000-01boroughs, 2000-01
Aggregate rates of net migration show losses from all but three boroughs (& City of London)
Source: 2001 Census SMS level 1
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The importance of disaggregating net The importance of disaggregating net migration for London boroughs, 2000-01migration for London boroughs, 2000-01
Net rates of migration for boroughs with the rest of GB
Net rates of migrationfor boroughs within London
Source: 2001 Census SMS level 1
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Developments from 1991Developments from 1991
• Coverage of whole UK (for most interaction data)• 100% data for all interaction data including SWS• Data on journey to place of study in Scotland (STS)• Student migration to, at and from university• Richer data: more tables and detail within tables• Additional sets of tables at ‘output area’ level• Imputation of missing data on workplace and migrants’
origins (if not stated and not ‘no usual address 1 yr ago’• New concept of ‘moving groups’ in SMS• Different approach to disclosure control
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In comparison with 1991 Census, there are a similar In comparison with 1991 Census, there are a similar number of tables but: (1) considerably more counts in 2001, number of tables but: (1) considerably more counts in 2001,
(2) all the counts are 100% in 2001, (3) OA level(2) all the counts are 100% in 2001, (3) OA level
Data sets
Level 1 (District)
Level 2(Ward)
Level 3(OA)
2001 SMS
10 tables, 996 counts
5 tables, 96 counts
1 table, 12 counts
1991 SMS
11 tables, 94 counts
2 tables, 12 counts
-
2001 SWS
7 tables, 936 counts
6 tables, 354 counts
1 table, 36 counts
1991 SWS*
- Set C: 9 tables, 274 counts
-
2001 STS
7 tables, 1,176 counts
6 tables, 478 counts
1 table, 50 counts
* 10% sample
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Geographical units used in 2001 Geographical units used in 2001 SMS/SWS/STSSMS/SWS/STS
Country Level 1 Level 2 Level 3
England London Boroughs (33), Metropolitan Districts (36), Unitary Authorities (46), Other Local Authorities (239)
CAS wards (7,969)
Output areas (165,665)
Wales Unitary Authorities (22) CAS wards ( 881) Output areas (9,769)
Scotland Council Areas (32) ST wards ( 1,176) Output areas (42,604)
Northern Ireland
Parliamentary Constituencies (18)
CAS wards (582 ) Output areas (5,022)
Total Districts (426) Interaction wards (10,608)
Output areas (223,060)
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Adjustment for disclosure control in 2001Adjustment for disclosure control in 2001
• Various methods used by ONS in 2001– minimum thresholds of people and
households before the release of data– record swapping between areas– small cell adjustment method (SCAM)
• SCAM assumed to adjust values of 1 and 2 to values of 0 and 3
• Significant impact on flows, especially at OA level
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How many UK internal migrants? How many UK internal migrants?
Seven different counts of total migration in 2001 SMS for 2000-01 period:
Level from which total derivedTable Level 1 Level 2 Level 3
Table 1 (Total): 6,202,016 6,267,740 6,164,996
Table 2 (Family status): 6,204,876 na na
Table 3 (Ethnicity): 6,206,216 6,190,926 na
Table 4 (LTL illness): 6,205,128 na na
Source: 2001 Census SMS tables
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CIDS interaction data holdingsCIDS interaction data holdings
Type Migration Commuting
2001
Raw SMS (Levels 1, 2, 3) SWS, STS (Levels 1, 2, 3)
1991
Raw SMS (Sets 1 and 2), Table 100 SWS (Sets A, B, C)
Derived MIGPOP, SMSGAPS
Derived SMS Set 1 for 2001 areas SWS Set C for 2001 areas
1981
Raw SMS Set 2 (County and region) SWS Set C (County and region)
Derived SMS Set 2 for 2001 areas SWS Set C for 2001 areas
Derived SMS Set 2 for 1991 areas SWS Set C for 1991 areas
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2 WICID2 WICIDCIDS homepage: http://cids.census.ac.uk/CIDS homepage: http://cids.census.ac.uk/
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WICID home pageWICID home page
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WICID general query interfaceWICID general query interface
See paper in Environment and Planning A (2003) for further details
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Selection of origins or destinationsSelection of origins or destinationsWhen choosing origins or destinations, users are confronted with a set of alternative selection tools
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Map Map selection selection window window in WICIDin WICID
WICID uses Post GIS extendedPostgresSQLdatabase and MapServerlibrary components
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Example of a query: Example of a query: to select flows to City of to select flows to City of London from districts in SE and other regionsLondon from districts in SE and other regions
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Analytical Analytical ToolsTools
Some basic statistics
Suite of indicatorsSome of which require additional data: e.g. distances populations at risk
Assembly of PARs is currently underway for 2001 data sets: needs specially commissioned counts for some variables
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Migration Migration effectiveness effectiveness by ethnic by ethnic group for group for regions, regions,
2000-012000-01
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Connectivity of London boroughs by ethnic groupConnectivity of London boroughs by ethnic group
0.00
0.20
0.40
0.60
0.80
1.00
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
Boroughs ranked by index
Ou
tflo
w C
I (w
ith
in G
L)
White
Indian
Pakistani and OSA
Chinese
Black
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
Boroughs ranked by index
In-c
om
mu
tin
g C
I (W
ith
in G
L)
White
Black
Indian
Pakistani and OSA
Chinese
Source: 2001 Census SMS and SWS level 1
Out-migration In-commuting
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3 From CIDS to CIDER (Centre for 3 From CIDS to CIDER (Centre for Interaction Data Estimation and ResearchInteraction Data Estimation and Research
• CIDS useage statistics
0
200
400
600
800
1000
1200
2003Q1 2003Q2 2003Q3 2003Q4 2004Q1 2004Q2 2004Q3 2004Q4 2005Q1 2005Q2 2005Q3
2001 SWS / STS
2001 SMS
1991 Table 100
1991 SWS
1991 SMS
1981 SWS
1981 SMS
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Objectives of CIDERObjectives of CIDER
• To continue delivery of a high quality service• To redesign WICID database structure and
develop user interface• To gather/estimate further UK census-based
data sets (e.g. commissioned tables, SOA-SOA flows)
• To expand WICID to include UK non-census data sets (e.g. from NHSCR, patient registers, HESA)
• To provide training, to upgrade documentation and to disseminate
• To advise on 2011 Census and prepare for inclusion of interaction data sets in WICID
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AcknowledgementAcknowledgement
CIDS is funded by the ESRC/JISC under Census Programme Research Grant
H507255177
CIDER is funded by the ESRC under Census Programme Research Grant
RES-348-25-0005
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4 UPTAP: Overview4 UPTAP: Overview
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Primary aims of UPTAPPrimary aims of UPTAP
• To build capacity in secondary data analysis
• To promote the use of large-scale social science data sets, both qualitative and quantitative
• To improve our understanding of demographic trends and processes which affect society and the population
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• To build capacity in secondary data analysis amongst new and mid-career researchers
• To spread knowledge and use of secondary analysis through and beyond the social science community
• To add value to the ESRC investments in the collection, preservation and promotion of large-scale national data sets by encouraging their use and exploitation
• in the longer term, to maximize the knowledge gained about economic and social change from secondary data analysis
Principal objectives of UPTAPPrincipal objectives of UPTAP
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• ESRC National centre for Research Methods (NCRM)
• ESRC Research Methods Programme
• ESRC Researcher Development Initiative
• ESRC Census Programme
• ESRC National Centre for e-Social Science (NCeSS)
Other ESRC initiativesOther ESRC initiatives
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• 4 Postdoctoral Fellowships• 7 Mid-career Research Fellowships
(including 1 User Fellowship)• 7 Small Research Grants• 3 larger capacity building projects
(with linked studentships)
• In total, 21 projects involving 31 researchers
Initial UPTAP awardsInitial UPTAP awards
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THEMESTHEMES
• Demographic change - Residential change
• Fertility - Motherhood - Childlessness• Living arrangements - Childcare• Cohabitation - Mobility• Health - Wellbeing - Employment• Education• Identity - Ethnicity - Segregation• Social and political values
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• 1 October 2005Saffron Karlsen and James Nazroo: Being a Muslim in Europe: attitudes and experiences Yaojun Li and Anthony Heath: Socio-economic position and political support of the BMEs in Britain 1971-2004 Paul Norman: The micro-geography of demographic change 1991-2001
• 1 November 2005Roona Simpson: Delayed childbearing and childlessness in Britain : the 1958 and 1970 cohorts compared Eric Kaufman: A dying creed? The demographic contradictions of liberal capitalism
Those projects underway in 2005Those projects underway in 2005
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Those projects commencing on 1 Jan 2006Those projects commencing on 1 Jan 2006• Ernestina Coast: Currently cohabiting: relationship attitudes, intentions
and behaviour
• Shu-Li Cheng: The impact of educational qualifications on trends in leisure activities
• Dan Vickers: The changing residential patterns of the UK 1991-2001 • Dimitris Ballas: Exploring geographies of happiness and well-being in
Britain
• Daniel Guinea-Martin: Trends in gender and ethnic occupational segregation in England and Wales: longitudinal evidence
• Kirstine Hansen, Heather Joshi and Denise Hawkes: Motherhood and child outcomes: the consequences of the timing of motherhood and mothers' employment on child outcomes
• Sarah Smith, Anita Ratcliffe and Mike Brewer: Understanding the effect of public policy on fertility; secondary data analysis
• Harriet Young and Emily Grundy: Living arrangements, health and well-being: a European perspective
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Those projects commencing in last 6 monthsThose projects commencing in last 6 months
• 1 February 2006Paula Surridge: The making of social values: social attitudes and social change
• 1 March 2006Patrick Sturgis and Nick Allum: Social and political trust: a longitudinal and comparative perspective
• 1 June 2006Paul Boyle, Vernon Gayle, Elspeth Graham and
Ali Zohoor: Does stepparenting influence mental health?
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• 1 August 2006
Alison Smith: Intergenerational contributions to childcare across
Europe Oliver Duke-Williams: Links between internal migration, commuting and inter-household relationships
• 1 October 2006Michelle Jackson: Investigating inequalities in educational attainment
Gopalakrishnan Netuveli: Treating longitudinal data as longitudinal: comparing models to describe employment status and health trajectories in British Household Panel Survey
• 1 May 2007Claudia Thomas: How does employment affect cardiovascular risk? A life-course approach in the 1958 cohort
Those projects yet to commenceThose projects yet to commence
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UPTAP web site: www.uptap.netUPTAP web site: www.uptap.net