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Census-based Migration in the UK: That’s WICID  John Stillwell School of Geography University of Leeds  Paper presented at the 45th Congress of the  European Regional Science Association,  Vrije Universiteit Amsterdam,  23-27 August 2005 Presentation Census migration interaction data in the UK  Primary SMS data sets Adjustment problems and derived data sets Estimates of net migration rates for London boroughs, 2000-01 CIDS response to problem of boundary changes over time is to re-estimate flows Web-based Interface to the Census Interaction Data (WICID): some features WICID welcome screen Summary:   migration to and from Kensington and Chelsea Age pyramid of migrants WICID’s general query interface Example query to select migration data Example of map selection Analysis indicators UK internal migration in 2000-01:  some characteristics  Comparison at national level UK migration in 2000-01 by age UK migration in 2000-01 by family status percentage UK migration in 2000-01 by ethnic percentage Summary of net migration by type of local authority Net migration and migration effectiveness, 2000-01 Slide 22 Importance of defining the spatial system for  net migration: London boroughs in 2000-01 Slide 24 Change (%) in migration between 1990-91 and 2000-01 by age and sex Net migration by district in 1990-01 and 2000-01 How valid are these comparisons?  What are the difficulties in making comparisons? Problems 1 Definition of migration variables Are these individuals recorded in the SMS? Net migration of students 2000-01 Problems 2 Measurement and adjustment of counts Problems 3: Inconsistency in geographical areas 1990-01 and 2000-01 Total Migration Compared Net migration (adjusted) for intermediate zones in 1990-91 and 2000-01 Scatterplot of net migration balances in  1990-91 and 2000-01 Conclusions