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WICID AND THE 2001 INTERACTION DATA  Presentation What is WICID? Census 2001 interaction data sets Geographical units used in 2001 SMS/SWS/STS Data tables and counts compared with 1991 Tables and counts in the 2001 and 1991 interaction data sets Tables and counts from 2001 SMS Level 1 and 1991 SMS Set 2 Adjustment for disclosure control Impact of SCAM on output area flows Impact of SCAM: e.g. on distribution of interior cell values in SMS Table MG301 (excluding Scotland) Other effects of SCAM Impact of SCAM when comparing tables: e.g. SMS at level 2 Comparing total migrants in MG201 and MG203: distribution of absolute differences between alternative totals Impact of SCAM when comparing flows between spatial scales Net migration comparison for London boroughs WICID interface developments WICID home page WICID general query interface Example of a query Technical details What new facilities have been developed in WICID? When choosing origins or destinations, users are confronted with a set of alternative selection tools Slide 24 Example:  Selection of City of London as a destination   Analytical Tools Example:   Migration effectiveness by ethnic group for GO regions, 2000-01  Using the 2001 data: some examples Slide 29 The importance of disaggregating net migration for London boroughs, 2000-01 Net migration (GL only), selected ethnic groups, 2000-01 Example 2:   Migration flows and net balances by age group for London, 2000-01 Net migration effectiveness by age, London, 2000-01 Example 3: Connectivity within London Out-migration and in-commuting connectivity for London boroughs by ethnic group, 2001 Conclusions Acknowledgement  CIDS is funded by the ESRC/JISC under Census Programme Research Grant H507255177