This series of papers summarises the methodological approaches we have taken in carrying out innovative or novel analysis. Such analysis is conducted under our statutory authority to examine and report to Parliament on the economy, efficiency and effectiveness with which government departments and other bodies have used their resources. The Audit insights papers are methodological summaries and do not make new observations about value for money.

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This paper sets out how we used an analytical technique called multilevel regression modelling to investigate the factors affecting levels of attendance at accident and emergency (A&E) departments by patients registered at a GP practice.