Methodology
We take all new workers into trade industries and determine how many months they have worked within that industry over the next 5 years. From this, we determine the number of workers that retain working in the industry at each month. We apply additional breakdowns by their age group and whether they start an apprenticeship within the first year of starting work.
Note that the data has been suppressed by StatsNZ randomly rounding counts to base three, explaining why the lines are bumpy and sometimes jump up when they should not increase. To counteract this, the lines have been smoothed by a moving average with a window of 5 months.
We have included a variable slider called 'Month threshold' this allows you to limit the starting point of the retention curve to only employees who have been employed at least that many months. For instance, you may be only interested in the retention of employees who make it past the 90 day trial period. To do this you can set the month threshold to 3.
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.
