Families and households: extended family type (information about this variable and its quality)


An extended family is a group of related people who usually reside together:

  • either as a family nucleus with one or more other related people, or
  • as two or more related family nuclei, with or without other related people.

Included are people who were absent on census night but who usually live in a particular dwelling and are members of an extended family in that dwelling, as long as they were reported as being absent by the reference person on the dwelling form or the household



Variable Details

Other Variable Information

This variable is currently not available for use.

Priority level

Priority level 2

We assign a priority level to all census variables: Priority 1, 2, or 3 (with 1 being highest and 3 being the lowest priority).

Extended family type is a priority 2 variable. Priority 2 variables cover key subject populations that are important for policy development, evaluation, or monitoring. These variables are given second priority in terms of quality, time, and resources across all phases of a census.

The census priority level for extended family type remains the same as 2013.

Quality Management Strategy and the Information by variable for extended family type (2013) have more information on the priority rating.

Overall quality rating for 2018 Census

Very poor quality

Data quality processes section below has more detail on the rating for this variable.

Subject population

Extended families in occupied private dwellings

‘Subject population’ means the people, families, households, or dwellings to whom the variable applies.

How this data is classified

New Zealand Standard Classification of Extended Families V1.0.0

Extended family type is a hierarchical classification with three levels. Census only uses the first level of the classification. The criteria used to place an extended family into the first level of the classification is the number of generations present, and if two are present, whether they are adjacent or not. If two adjacent generations are present, the family is classified as a two-generation extended family. If two non-adjacent generations are present, the family is classified as a three- or more generation extended family.

1 One-generation extended family

2 Two-generation extended family

3 Three- or more generation extended family

9 Extended family not classifiable

The Standards and Classifications page provides background information on classifications and standards.

Question format

Extended family type is derived from the following questions:

On online forms:

  • the household set-up form asks for a resident list
  • the resident list includes visitors to the household.

The household set-up form asks about usual residents who are absent on census night, whether they are in New Zealand or overseas, and whether they are away for less than 12 months or 12 months or more.

On paper forms:

  • question 17 on the dwelling form: relationship to reference person
  • question 20 on the dwelling form: absentee relationship to reference person
  • question 17 on the individual form: living arrangements.

Stats NZ Store House has samples for both the individual and dwelling paper forms.

How this data is used

Outside Stats NZ

  • By central government agencies, local authorities, private organisations, and researchers in the formulation of social policy, for planning and monitoring programmes, and for research purposes.

Within Stats NZ

  • To derive household and family projections.

Data quality processes

We are currently investigating whether we can improve the quality of family and household data.

The very poor quality rating for family and household data is due to:

  • missing household data
  • non-responding dwellings with no admin enumerated individuals, resulting in no households at the dwellings
  • admin enumerated individuals placed in meshblocks rather than dwellings, leading to incomplete households.

Family and household data include the following problems:

  • people counted at the wrong address
  • duplicate forms
  • incorrect family coding
  • respondent error.

Revision Information

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3/10/2019 2:16:37 a.m.
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22/09/2019 9:53:26 p.m.


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