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IPS153 Jay L. et al.
far greater use of administrative data to produce these national estimates of
international migration in future, so we have carried out new research to
explore how we can develop a flows-based approach based on wider data
sources.
Our published research report outlined the challenges in measuring and
understanding how the population is changing over time, particularly for
immigration and emigration (flows, both nationally and locally).
We are confident that births and deaths are well recorded in administrative
sources. For long-term immigrants and emigrants, this is more challenging as
no single data source captures the patterns of movement for all types of
migrants. Like the data-driven rules described in the stocks-based approach,
we are developing a similar inclusion approach for long-term immigrants - we
are calling this confidence-based rules.
Our aim is to bring together the multiple sources to build a comprehensive
and granular evidence base for migration to (and eventually from) the UK.

Bringing it together: our proposed hybrid model
Focusing on these approaches separately offers us the opportunity to
produce the best-possible estimates for stocks and flows in future, using the
best data and methods available to us. However, to produce a coherent set
of statistics for our users requires us to develop an approach that brings the
two methods together.
Figure 2 sets out our hybrid model for delivering a transformed
population and migration statistics system. We call this a hybrid model to
reflect that we are aiming for an approach that produces the best possible
stocks and flows of the population.

Figure 2: Our proposed hybrid model

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