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Residual interpretation
Model significantly under-predicts flows between Dynamic London and Student Towns, and over-predicts flows within Student Towns - Why?
Highest volume of in-migration flows occurs 20-24 age group – post university. Model doesn’t account for huge pull of socio-economic ‘gravity’ from the Capital for this age group (compared to other destinations in GB)
Flows in other direction (some 6,500 people p.a) of 16-19 year olds are under-accounted for by model – model doesn’t account for significant higher education life course influence pulling students out of the Captial
Over-prediction of flows within student towns and cities partially caused by balancing effect of other under-predicted flows in the closed model system