An overview of population size estimation where linking registers results in incomplete covariates, with an application to mode of transport of serious road casualties

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RSS local group meetings

Thursday 14 February 2019, 04:00pm - 05:00pm

Location  Room A54, Postgraduate Statistics Centre, Lancaster University

The Royal Statistical Society's Lancashire and Cumbria local group are pleased to announce our next meeting with speaker Prof. Peter Van der Heijden, (University of Southampton). The talk will be followed by a wine reception in the Postgraduate Statistics Centre.


We consider the linkage of two or more registers in the situation where the registers do not cover the whole target population, and relevant categorical auxiliary variables (unique to one of the registers; although different variables could be present on each register) are available in addition to the usual matching variable(s). The linked registers therefore do not contain full information on either the observations (often individuals) or the variables. By treating this as a missing data problem it is possible to construct a linked data set, adjusted to estimate the part of the population missed by both registers, and containing completed covariate information for all the registers. This is achieved using an Expectation-Maximization (EM)-algorithm. We elucidate the properties of this approach where the model is appropriate and in situations corresponding with real applications in official statistics, and also where the model conditions are violated. The approach is applied to data on road accidents in the Netherlands, where the cause of the accident is denoted by the police and by the hospital. Here the cause of the accident denoted by the police is considered as missing information for the statistical units only registered by the hospital, and the other way around. The method needs to be widely applied to give a better impression of the range of problems where it can be beneficial. We also discuss estimates of human trafficking in the Netherlands for the years 2010-2015 by age, sex and type of exploitation.


Organiser Name Rhian Davies

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Organising Group(s) Lancashire and Cumbria RSS Local Group





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