Quality information for status in employment in the 2018 iwi affiliation estimated counts dataset

Quality rating: Moderate to poor quality

For many purposes, the 2018 iwi estimates provide a more relevant and up-to-date picture than continued use of 2013 Census iwi data. These iwi estimates are not official 2018 Census counts and the quality ranges from moderate to poor depending on how the data is used. It is difficult to understand changes occurring for an iwi over time for the population count as well as across characteristics due to differences between the 2018 and 2013 Censuses:

• Counts for the overall Māori descent population are substantially higher in 2018, reflecting improvements in the quality of Māori descent population counts in the 2018 Census as well as natural population change (births, deaths, migration). Māori descent – Information by Variable 2018 provides more information on the changes in the Māori descent population.

• Changes were made to the collection of iwi data in the 2018 Census, for example changes to the online form, and in 2017 there was a substantial review of the iwi classification with 32 iwi being added to the classification.

• There may also be a combination of real-world and methodological change at the characteristic level.

Producing estimates for the characteristics of an iwi is lower quality than we would expect from a census due to the high level of non-response. This is particularly the case when estimating the size of very small groups (e.g. <100).

The table below shows the contribution of data sources for the status in employment variable released in the 2018 iwi affiliation estimates counts dataset.

Due to the lower proportion of status in employment data sourced from the 2018 Census for the iwi estimate population, compared to the usually resident population, and there being no admin data sources available for this variable, we recommend that this data is used with caution.

Further information on the 2018 iwi affiliation estimated counts dataset

2018 Iwi affiliation estimated counts – DataInfo+ provides detailed information on the quality of the 2018 Iwi Affiliation Estimated Counts dataset.

Methodology for the 2018 iwi affiliation estimated counts provides detailed methodology for the 2018 iwi affiliation estimated counts.

Strengths and limitations of 2018 iwi affiliation estimated counts provides high level guidance on using the 2018 Iwi Affiliation Estimates Counts.

Iwi affiliation (estimated counts): 2018 data sources and quality by iwi provides estimated counts quality information by iwi.

Further information on the status in employment variable in the 2018 Census

Status in employment – Information by Variable (2018 Census) provides a more detailed summary of the differences between the 2013 Census and 2018 Census questionnaires and the quality of the 2018 Census status in employment counts. However, the quality rating provided in the 2018 document does not apply to the status in employment variable in the iwi estimated counts dataset.

2018 Census External Data Quality Panel: Assessment of variables provides quality information on status in employment and other variables measured in the 2018 Census.

Stats NZ Store House provides samples for both the 2018 individual and dwelling census paper forms.