Methodology
We take apprentices first enrollment into apprenticeship (level 4, 100+ credit) course (trade defined by MOE derived occupation). From these apprentices, we calculate the time between their start and end date as their completion duration.
Yearly income of apprentices is tracked from IRD tax records, taking income earned over the whole year from construction businesses only. Monthly income is adjusted for months not working in that year. Real measures are adjusted to 2020Q1 based on wage inflation.
Income is average between groups fitting under different cut offs based on completion duration.
Access to the data used in this study was provided by Stats NZ under conditions designed to give effect to the security and confidentiality provisions of the Data and Statistics Act 2022. The results presented in this study are the work of the author, not Stats NZ or individual data suppliers.
These results are not official statistics. They have been created for research purposes from the Integrated Data Infrastructure (IDI) which is carefully managed by Stats NZ. For more information about the IDI please visit https://www.stats.govt.nz/integrated-data/.
The results are based in part on tax data supplied by Inland Revenue to Stats NZ under the Tax Administration Act 1994 for statistical purposes. 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.
