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The IDI prototype spine’s creation and coverage

Statistics New Zealand Working Paper No 16–03

Andrew Black

Abstract

The Integrated Data Infrastructure (IDI) is a collection of linked datasets that allows evaluation and research on the pathways, transitions, and outcomes of people. There is one specific dataset, called the ‘spine’, to which all of the other datasets link. It is imperative it covers the target population as much as possible. A spine with poor coverage severely limits research use of the IDI.

New data collections are continuously being added to the IDI. This allows Statistics New Zealand to periodically assess the spine, and a chance to decide on the make-up of the spine. Before 2015, the spine was created from only one source – Inland Revenue data.

This paper describes the process to create the new spine, which is termed the IDI prototype spine. We used the target population for the new spine and the spine assessment criteria to decide on the three data sources for the prototype spine: tax, births, and visa data. These were combined to create a singular spine dataset.

We then evaluated the prototype spine by looking at its composition, over- and under-coverage, and making a link-rate comparison with the previous Inland Revenue-only spine.

The results suggest the prototype spine is a significant improvement, particularly for the coverage of an ‘ever-resident New Zealand population’.

Further work is required to work on known areas of over- and under-coverage, and on new data collections available since the prototype spine was introduced, such as health and Census 2013.

To read the paper, download or print the PDF from the 'Available files' box. If you have problems viewing the file, see Opening files and PDFs.

Citation
Black, A (2016). The IDI prototype spine’s creation and coverage. (Statistics New Zealand Working Paper No 16–03). Retrieved from www.stats.govt.nz.

ISBN 978-0-908350-54-4 (online)
ISSN 1179-934X (online)

Published 6 July 2016

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