Income
Individual income quartiles
About this topic
Individual income quartiles group people aged 15 years and over into four evenly sized income ranges so the distribution of personal income can be compared objectively across areas and over time. The quartile method focuses on relative position in the income distribution rather than raw dollar brackets.
This topic is useful because direct income amounts are affected by inflation and wider economic change. Quartiles provide a clearer way to compare whether an area is becoming relatively lower, middle, or higher income over time.
Interpretation notes
- This is a derived distribution of personal income for people aged 15 years and over, with each quartile representing a quarter of the income distribution.
- Quartiles show relative position rather than fixed dollar brackets, which makes them more robust for comparisons over time.
Key insight
In 2021, the highest income quartile held the largest share among residents aged 15 and over in Singleton (WA), accounting for 33.4%.
Section overview
Individual income quartiles
Singleton (WA) - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for Singleton (WA) in 2021 for persons, with comparison against Rockingham (C) and change since 2016.
Individual income quartiles snapshot
2021 distribution by category for Singleton (WA), with comparison markers for Rockingham (C).
Lowest group
2021 count
691
% of total
23.9%
Change from 2016
-4.4pp
691
23.9%
-4.4pp
Medium lowest
2021 count
650
% of total
22.5%
Change from 2016
+5.2pp
650
22.5%
+5.2pp
Medium highest
2021 count
582
% of total
20.2%
Change from 2016
+0.4pp
582
20.2%
+0.4pp
Highest group
2021 count
965
% of total
33.4%
Change from 2016
-1.2pp
965
33.4%
-1.2pp
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
-34
-4.4pp
Medium lowest
+207
+5.2pp
Medium highest
+75
+0.4pp
Highest group
+77
-1.2pp
Data table
Individual income quartiles for Singleton (WA). Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Rockingham (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Rockingham (C)% | Count | % | Rockingham (C)% | Count | pp | |
| Lowest group | 691 | 23.9% | 25.9% | 725 | 28.3% | 25.3% | -34 | -4.4pp |
| Medium lowest | 650 | 22.5% | 24.8% | 443 | 17.3% | 22.9% | +207 | +5.2pp |
| Medium highest | 582 | 20.2% | 22.6% | 507 | 19.8% | 22.1% | +75 | +0.4pp |
| Highest group | 965 | 33.4% | 26.7% | 888 | 34.6% | 29.6% | +77 | -1.2pp |
| Total persons aged 15+ | 2,888 | 100.0% | 100.0% | 2,563 | 100.0% | 100.0% | +325 | 0.0pp |