Total personal income, grouped (iwi estimates)

Variable Description

Name

i_grouped_personal_income_code ^en-NZ

Label

Total personal income, grouped (iwi estimates) ^en-NZ

Description

Total personal income received is the total before-tax income of a person in the 12 months ended 31 March 2018. The information is collected as income bands rather than in actual dollars.

Grouped personal income combines the total personal income categories into broader income categories. This allows more information to be released for small geographic areas and population groups.

See Ariā for the Census grouped personal income V2.0.0 classification.

^en-NZ

Other Variable Information

Quality information for total personal income 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 total personal income variable released in the 2018 iwi affiliation estimates counts dataset.

Data sources for grouped total personal income - 2018 iwi estimated counts population
Source	Percent
2018 Census response	68.8 percent
2013 Census response	0.0 percent
Administrative data	14.7 percent
Statistical imputation	1.3 percent
No information	0.0 percent
Weighting	15.2 percent
Total	100.0 percent
_{Due to rounding, individual figures may not always sum to the stated total(s)}

Please note that the percentage of data sourced from administrative data or statistical imputation varies across income bands.

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 total personal income variable in the 2018 Census

Total personal income – 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 total personal income counts. However, the quality rating provided in the 2018 document does not apply to the total personal income variable in the iwi estimated counts dataset.

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

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

This variable is not part of a dataset.