UCL DEPARTMENT OF GEOGRAPHY  Geodemographic Output Area  Classifications for London, 2001-2011  Chris Gale*           Paul...
UCL DEPARTMENT OF GEOGRAPHY  Outline  •   Geodemographic Classifications  •   The 2001 Output Area Classification  •   Lon...
UCL DEPARTMENT OF GEOGRAPHY  Geodemographic Classifications  • A Geodemographic Classification:        – Simplifies a larg...
UCL DEPARTMENT OF GEOGRAPHY  The 2001 Output Area Classification (OAC)  • Groups the UK population    into:        – 7 Sup...
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY  OAC Cluster Distributions - UK and London      Supergroup              OAC - UK        OAC - ...
UCL DEPARTMENT OF GEOGRAPHY  OAC Cluster Distributions - UK and London
UCL DEPARTMENT OF GEOGRAPHY  2001 London Output Area Classification  • Same methodology as the 2001 OAC  • Uses same Censu...
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY  2001 LOAC Cluster Distributions      Supergroup              OA Count   OA Percentage (%)    ...
UCL DEPARTMENT OF GEOGRAPHY  2001 OAC vs. 2001 LOAC Cluster Profiles  • 2001 LOACs clusters significantly different to tho...
UCL DEPARTMENT OF GEOGRAPHY  Bespoke Geodemographic Classifications  • Being able to easily create bespoke classifications...
UCL DEPARTMENT OF GEOGRAPHY  Change and OAC Uncertainty  • Change happens across the UK – but this change    happens at di...
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY  Uncertainty in London: 2001 OAC Case Study  • Uses Mid-Year Population Estimates from 2002 to...
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY
UCL DEPARTMENT OF GEOGRAPHY  Uncertainty in London: 2001 OAC Case Study  • Current lack of data at Output Area level makes...
UCL DEPARTMENT OF GEOGRAPHY  Summary  • The 2001 OAC does not classify London well  • The 2001 LOAC was created by Peterse...
UCL DEPARTMENT OF GEOGRAPHY                       Any Questions?                              Chris Gale                  ...
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Geodemographic Output Area Classifications for London, 2001-2011

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Presentation given by Chris Gale on Friday 13th April at GISRUK 2012.

For more information on GISRUK 2012: www.lancs.ac.uk/gisruk2012

For further research by Chris Gale: mapblog.in

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  • Point 2 – i.e. birds of a feather flock together
  • Geodemographic Output Area Classifications for London, 2001-2011

    1. 1. UCL DEPARTMENT OF GEOGRAPHY Geodemographic Output Area Classifications for London, 2001-2011 Chris Gale* Paul Longley mapblog.in paul-longley.com @geogale * Conference attendance kindly supported by RGS-IBG funded QMRG bursary UCL Department of Geography, Gower Street, London, WC1E 6BT
    2. 2. UCL DEPARTMENT OF GEOGRAPHY Outline • Geodemographic Classifications • The 2001 Output Area Classification • London and the 2001 Output Area Classification • Change since 2001 • Uncertainty and the 2001 Output Area Classification • Summary
    3. 3. UCL DEPARTMENT OF GEOGRAPHY Geodemographic Classifications • A Geodemographic Classification: – Simplifies a large and complex body of information about a population, where and how they live and work. – Based on premise that similar people live in similar locations, undertake similar activities and have similar lifestyles and that such area types will be distributed in different locations across a geographical space • Clustering algorithms partition demographic data into groups sharing similar characteristics • Commercial (MOSAIC, ACORN) and free (OAC) classifications available
    4. 4. UCL DEPARTMENT OF GEOGRAPHY The 2001 Output Area Classification (OAC) • Groups the UK population into: – 7 Supergroups – 21 Groups – 52 Subgroups • Only data source used is the 2001 Census – 41 Variables • Variety of organisations use it including local government and commercial companies
    5. 5. UCL DEPARTMENT OF GEOGRAPHY
    6. 6. UCL DEPARTMENT OF GEOGRAPHY OAC Cluster Distributions - UK and London Supergroup OAC - UK OAC - London Blue Collar 16.1% (35837) 2.5% (606) Communities City Living 7.5% (16637) 21.4% (5174) Countryside 12.4% (27681) 0.1% (21) Prospering Suburbs 21.2% (47250) 7.4% (1782) Constrained by 14.9% (33165) 2.5% (592) Circumstances Typical Traits 18.3% (40769) 10.1% (2430) Multicultural 9.7% (21721) 56.1% (13535) Counts in brackets
    7. 7. UCL DEPARTMENT OF GEOGRAPHY OAC Cluster Distributions - UK and London
    8. 8. UCL DEPARTMENT OF GEOGRAPHY 2001 London Output Area Classification • Same methodology as the 2001 OAC • Uses same Census variables as the 2001 OAC - but includes only data for London • 24,140 OAs cover London - instead of the 223,060 OAs that cover the UK • London contains 9.24% of UK’s OAs and 12.5% of UK’s population • 7 Supergroups created – Groups and Subgroups levels were not clustered • Based on Petersen et.al. 2010 paper
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    10. 10. UCL DEPARTMENT OF GEOGRAPHY 2001 LOAC Cluster Distributions Supergroup OA Count OA Percentage (%) Suburban 2506 10.4 Council Flats 3678 15.2 Asian Quarters 2716 11.3 Central District 3409 14.1 Blue Collar 3114 12.9 City Commuter 3542 14.7 London Terraces 5175 21.4
    11. 11. UCL DEPARTMENT OF GEOGRAPHY 2001 OAC vs. 2001 LOAC Cluster Profiles • 2001 LOACs clusters significantly different to those of the 2001 OAC – Difference meant using same cluster names and profiles as OAC was not possible for LOAC • Cluster names and profiles for 2001 LOAC created by Petersen et.al. • Illustrates different results can be created by a regional classification compared to a national alternative • 2001 LOAC better representation of London compared to the 2001 OAC - but lacks compatibility and comparability with rest of the UK
    12. 12. UCL DEPARTMENT OF GEOGRAPHY Bespoke Geodemographic Classifications • Being able to easily create bespoke classifications without any expert knowledge is one possible solution to unsatisfactory cluster assignment • Using tools like ‘GeodemCreator’ classifications could have (but not limited to): – The variables modified – The geography changed – Different standardisation techniques and clustering algorithms used • In the case of the 2001 OAC this could resolve a problem when used at a regional level (e.g. London)
    13. 13. UCL DEPARTMENT OF GEOGRAPHY Change and OAC Uncertainty • Change happens across the UK – but this change happens at different rates for different areas • The 2001 OAC uses Census data that is now 11 years old • How much uncertainty in the 2001 OAC since 2001? • This uncertainty will vary depending on the amount of change that has occurred in a particular area over time • A measure can be calculated to indicate how reliable the 2001 OAC becomes over time
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    17. 17. UCL DEPARTMENT OF GEOGRAPHY Uncertainty in London: 2001 OAC Case Study • Uses Mid-Year Population Estimates from 2002 to 2010 at Output Area level • Assumption: – The greater the population change from 2001 the greater the uncertainty • Allows for the uncertainty of different OAC Supergroups to be compared over time • Different methods can be used to visualise this uncertainty
    18. 18. UCL DEPARTMENT OF GEOGRAPHY
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    20. 20. UCL DEPARTMENT OF GEOGRAPHY
    21. 21. UCL DEPARTMENT OF GEOGRAPHY
    22. 22. UCL DEPARTMENT OF GEOGRAPHY
    23. 23. UCL DEPARTMENT OF GEOGRAPHY
    24. 24. UCL DEPARTMENT OF GEOGRAPHY Uncertainty in London: 2001 OAC Case Study • Current lack of data at Output Area level makes creating a more comprehensive measure of uncertainty difficult • Assumes the greater the population change the more uncertain the classification – BUT population change could also be reaffirming OAC Supergroup allocation • Should be used as more of a note of caution when using the 2001 OAC rather than a definite answer to if the classification is now ‘wrong’ • The uncertainty of the uncertainty measure needs to be taken into account
    25. 25. UCL DEPARTMENT OF GEOGRAPHY Summary • The 2001 OAC does not classify London well • The 2001 LOAC was created by Petersen et.al is one solution to this • A measure of uncertainty gives some understanding how reliable geodemographic classifications (that do not employ updating of variables) become over time • The uncertainty measures themselves have a level of uncertainty • Uncertainty measure does not quantify how much the OAC Supergroup assignment is ‘wrong’– BUT does allow for areas of possible change to be identified
    26. 26. UCL DEPARTMENT OF GEOGRAPHY Any Questions? Chris Gale mapblog.in areaclassification.org.uk @geogale c.gale.10@ucl.ac.uk

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