The data used on this website is sourced from Statistics New Zealand's Integrated Data Infrastructure (IDI). The IDI is a large research database containing microdata about people and households. Data is from a range of government agencies, Statistics NZ surveys including the Census, and non-government organisations. The data is about life events including education, income, benefits, migration, justice, and health. The IDI holds over 166 billion facts, taking up 1.22 terabytes of space – and is continually growing. Researchers like Scarlatti use the IDI to gain insight into New Zealand society, and to help answer complex questions. For more information on the IDI, visit the Integrated Data Infrastructure page on the Statistics New Zealand website.
The results on this website are not official statistics. They have been created for research purposes from the Integrated Data Infrastructure (IDI), managed by Statistics New Zealand. The opinions, findings, recommendations, and conclusions expressed on this website are those of the author(s), not Statistics NZ. Access to the anonymised data used in this study was provided by Statistics NZ under the security and confidentiality provisions of the Statistics Act 1975. Only people authorised by the Statistics Act 1975 are allowed to see data about a particular person, household, business, or organisation, and the results on this website have been confidentialised to protect these groups from identification and to keep their data safe. Careful consideration has been given to the privacy, security, and confidentiality issues associated with using administrative and survey data in the IDI. Further detail can be found in the Privacy impact assessment for the Integrated Data Infrastructure on the Statistics New Zealand website.
The results are based in part on tax data supplied by Inland Revenue to Statistics NZ under the Tax Administration Act 1994. This tax data must be used only for statistical purposes, and no individual information may be published or disclosed in any other form, or provided to Inland Revenue for administrative or regulatory purposes. Any person who has had access to the unit record data has certified that they have been shown, have read, and have understood section 81 of the Tax Administration Act 1994, which relates to secrecy. Any discussion of data limitations or weaknesses is in the context of using the IDI for statistical purposes, and is not related to the data’s ability to support Inland Revenue’s core operational requirements.