Big Data reports

Many of our projects have a strong focus on utilising linked administrative data, and in particular the Statistics New Zealand's Integrated Data Infrastructure (IDI). Stats NZ published a range of case studies highlighting the types of research being carried out using the IDI. Our report 'Empirical Evidence of the Gender Pay Gap', published in 2017, was chosen as part of this campaign due to the insights gained from utilising the IDI.

See the Stats NZ's poster - How integrated data helps: shine a light on the gender pay gap

This page lists some examples of our research reports that use Big Data.

In-work Poverty in New Zealand

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Funder: The Human Rights Commission (HRC)

This report examines the prevalence of, and characteristics associated with, in-work poverty in New Zealand. The analysis within this study draws primarily on linked data from Inland Revenue and the 2013 Census, as well as supplementary information provided by the Household Labour Force Survey. In-work poverty is defined as the proportion of working households that fall below the poverty threshold.

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Characterising New Zealand's Underutilised Workforce

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Funder: Ministry of Business, Innovation and Employment (MBIE)

We use the Household Labour Force Survey to characterise and understanding the underutilised workforce in New Zealand. A worker is considered to be underutilised if they are unemployed, time-related underemployed or belong to the potential labour force. We also explore the transience of underutilisation and identify potential drivers of the duration of underutilisaiton and unemployment.

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Workplace Health and Safety in the Home and Community Care Sector

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Funder: Home and Community Health Association

The aim of this literature review was to understand the causes and drivers of workplace injury in home-based health and disability support services. The literature review was based on international academic research, government generated research and reports, reputable consultancy organisations and other organisations such as unions.

This report is confidential


Health Care Homes: Early Evidence in Wellington

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Funder: Productivity Commission

This report presents a case study analysis on one part of the New Zealand healthcare system. We focus on the NZ Health Care Home initiative and investigate the impact of its implementation on a wide array of health events.

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Individualising entitlements in New Zealand's benefit and social assistance systems

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Funder: Superu

The purpose of this report is to examine the possibility of modernising New Zealand's welfare and social assistance system to remove or reduce reliance on the couple-based unit of assessment and the associated requirement for relationship status testing.

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Parenthood and labour market outcomes

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Funder: Ministry for Women

This is a report commissioned by the Ministry for Women, and written in conjunction with Motu. This study combines administrative monthly earnings data, birth records, and survey information on hours worked and earnings to describe the labour market outcomes of men and women as they have children, as well as how parenthood contributes to the gender pay gap in NZ.


Residential movement within New Zealand: Quantifying and characterising the transient population

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Funder: Superu

The Social Policy Evaluation and Research Unit manages a Ministerial fund for social sector research. It is under that umbrella that this project was commissioned. This study presents the first attempt at quantifying the scale of transience and vulnerable transience in NZ, and a description of who these people are. Understanding who is at risk of being transient will inform the work of a number of social sector agencies who deliver services to vulnerable populations.

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Low pay in NZ

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Funder: Ministry of Business, Innovation and Employment

This research aims to better understand the low pay sector within New Zealand, and the changing nature of this group in recent years. A particular focus of the study was on identifying who is low paid, to build a comprehensive portrait with regard to their individual, household, and job characteristics, over the period 2006 to 2015. This is the first time that the the IDI has been interrogated in this way.

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Empirical evidence of the gender pay gap in New Zealand

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Funder: Ministry for Women

The size of the gender pay gap in NZ is approximately 12%, based on 2015 data. This is consistent with that found by Dixon (2003), indicating that the gender pay differential hasn’t narrowed in the last decade. We examine this gap with the Oaxaca Blinder decomposition method and find that just over 83% of the gap is unexplained; after controlling for differences in individual, household, occupation, industry and other job characteristics. We also test the robustness of the results with use of a matching approach and continue to find that the unexplained proportion dominates. Finally, we test the hypotheses of a glass ceiling and sticky floor and find evidence in favour of the former, with the proportion of the pay gap that is unexplained rising as we move up the wage distribution.

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Explaining ethnic disparities in bachelor's qualifications: participation, retention and completion in NZ

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Funder: Productivity Commission

There are substantial ethnic gaps in higher education in NZ, despite more than a decade of considerable policy effort aimed at this concern. This study uses newly linked administrative data to examine the underachievement of Māori and Pasifika relative to Europeans. We follow a population cohort born between 1990 and 1994 from school through to young adulthood to assess the relative contributions of prior academic performance, socioeconomic status and parental education to these gaps.

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Big data reports prior to 2017

Other reports

Our document library holds reports for surveys, projects, presentations and Big Data. Working papers are also released here regularly.

Document library