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Identifying the New Zealand resident population in the Integrated Data Infrastructure

This paper describes a method for determining who is a resident in New Zealand at a given point in time using the linked administrative data sources held in Statistics New Zealand’s Integrated Data Infrastructure (IDI).

We compare the resulting national population by age and sex (the IDI-ERP) with the official estimated resident population figures, and assess the accuracy against quality standards developed for Census Transformation.

The IDI-ERP population is 2 percent larger than the official population estimate. Coverage patterns vary by age and sex, with some age groups very close to official population estimates, but high net overcoverage in early adult ages (20–34 years), especially for males.

The structure of the linked administrative data available in the IDI, with a spine that targets those 'ever resident' in New Zealand linked to records of activity in health, taxation and education, international border movements and deaths, provides a solid basis for identifying a New Zealand resident population at a given time.

However, further work is needed to understand the causes of undercoverage and erroneous inclusions that are apparent from this study.

Disclaimer
This paper represents the views of the author. It does not necessarily represent the views of Statistics NZ and does not imply commitment by Statistics NZ to adopt any findings, methodologies, or recommendations. Any data analysis was carried out under the security and confidentiality provisions of the Statistics Act 1975.

Read Identifying the New Zealand resident population in the Integrated Data Infrastructure (IDI) online or download or print the PDF from the 'Available files' box. If you have problems viewing the files, see opening files and PDFs.

Citation
Gibb, S, Bycroft, C, Matheson-Dunning, N (2016). Identifying the New Zealand resident population in the Integrated Data Infrastructure (IDI). Retrieved from www.stats.govt.nz.

ISBN 978-0-908350-33-9 (online)
Published 5 April 2016 

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