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Integrated Data Infrastructure

Statistics NZ’s Integrated Data Infrastructure (IDI) is a linked longitudinal dataset that covers an extended range of pathways and transitions information. The IDI allows for policy evaluation and research analysis, and the production of statistical outputs on the transitions and outcomes of people. It currently includes economic, education, justice, health and safety, migration, families and households, tenancy, and business data.

The IDI is used by a number of researchers from across government to answer a wide range of important research, policy, and evaluation questions.

Approved research access

All research proposals are assessed using our microdata access protocols.

Integrated Data Infrastructure extension: Privacy impact assessment has been prepared in consultation with the Office of the Privacy Commissioner to ensure that we continue to follow best practice and are open and transparent about how we are protecting information.

We are required by law to protect the information we collect. These requirements are outlined in the Statistics Act 1975 and the Privacy Act 1993. Data available in the IDI is anonymised – personal identifying information such as names, addresses, and exact dates of birth have been removed and all unique identifiers are encrypted. All research is checked before it's released to ensure no information about individual people, households, or businesses is published or disseminated.

Statistics NZ operates within a ‘five safes’ framework to ensure that access to microdata is only provided if all of the following conditions can be met:

  • safe people – researchers can be trusted to use data appropriately and follow procedures
  • safe projects – the project has a statistical purpose and is in the public interest
  • safe settings – security arrangements prevent unauthorised access to the data
  • safe data – the data itself inherently limits the risk of disclosure
  • safe output – the statistical results produced do not contain any disclosive results.

Information on how to apply for access is available through the Statistics NZ Data Lab.

IDI data and metadata

The IDI currently holds data from: Accident Compensation Corporation; Department of Corrections; Department of Internal Affairs; Inland Revenue; Ministry of Business, Innovation and Employment; Ministry of Education; Ministry of Health; Ministry of Justice; Ministry of Social Development; New Zealand Customs Service; New Zealand Police; and Statistics NZ.

See Data dictionaries for datasets in the IDI, with information about the data and metadata.

History of the IDI

In December 2011, Statistics NZ successfully completed a prototype of the IDI, including economic, education, migration, and business data. The IDI prototype was replaced and enhanced by the IDI in December 2012.

The IDI was extended in 2013 to include justice sector and health and safety data.

Tax data

From June 2014 tax data will be available in the IDI three months after it is supplied by Inland Revenue. This embargo time has been reduced to enable researchers to access timely, relevant data for research and policy advice.

Page updated 29 June 2015

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