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2001 Census Debriefing 2001 Data Issues Discussant: Ian Williams Policy & Research, WSP

10 April 2006 London. 2001 Census Debriefing 2001 Data Issues Discussant: Ian Williams Policy & Research, WSP. Usage of Census data. WSP Policy & Research is a branch of a large consultancy firm We specialise in research, development and usage of forecasting models

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2001 Census Debriefing 2001 Data Issues Discussant: Ian Williams Policy & Research, WSP

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  1. 10 April 2006 London 2001 Census Debriefing2001 Data IssuesDiscussant: Ian WilliamsPolicy & Research, WSP

  2. Usage of Census data WSP Policy & Research is a branch of a large consultancy firm We specialise in research, development and usage of forecasting models Household, population and employment location Regional economic development and freight transport Passenger travel demand Data with both spatial detail and segmentation detail are crucial to much of our work

  3. What would make our work more efficient? Data consistency across spatial units and across segments Avoid months of avoidable work to recreate the original multi-dimensional consistent data in the form it was prior to adjustment and suppression E.g. we need to generate zonal tables of employed residents jointly segmented by individual NS-SeC, full-/part-time, household size, car ownership, HRP NS-SeC through combining 4 or more 2-dimensional tables Consistent 10% data in 1991 was less problematic SDC within database must be better

  4. Negatives in 2001 Census Disclosure control procedures appears to be bias in results for JTW tables Workplace statistics as published, presented an insufficient proportion of the data available No employment by SIC below district level, even though data not published until late 2004! Workplace data suppressed because numbers resident (!) in area were below threshold In employment zones OAs should relate to spatial patterns of workplaces No published data anywhere on car ownership pattern at the workplace end of journeys to work Working away from usual home

  5. Positives in 2001 Adoption of newer classifications provides more homogeneous behaviour NS-Sec, SOC, SIC SARs are of great use for research to complement the spatial tables - but have even less geographic detail than 1991 2+ months of intense bureaucracy to obtain HH SAR Availability improvements are a huge plus sensible costing – unlike 1991 SWS online access for all

  6. The Future - 2011 Published data should have a more reasonable balance between Disclosure control Information provision Prior constructive discussion on disclosure control methods to be adopted Better input from Government Departments on data publication needs Workplace and journey to work data – DfT, ODPM Journey to school data – DfT, DfES Full CSV files to be available to researchers Supertable – right idea, wrong execution Better web based system needed

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