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 medium-low income quartile held the largest share among residents aged 15 and over in Wundowie, accounting for 29.2%.
Section overview
Individual income quartiles
Wundowie - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for Wundowie in 2021 for persons, with comparison against Northam (S) and change since 2016.
Individual income quartiles snapshot
2021 distribution by category for Wundowie, with comparison markers for Northam (S).
Lowest group
2021 count
262
% of total
26.1%
Change from 2016
+26.1pp
262
26.1%
+26.1pp
Medium lowest
2021 count
293
% of total
29.2%
Change from 2016
+13.4pp
293
29.2%
+13.4pp
Medium highest
2021 count
220
% of total
21.9%
Change from 2016
-25.5pp
220
21.9%
-25.5pp
Highest group
2021 count
229
% of total
22.8%
Change from 2016
-14.0pp
229
22.8%
-14.0pp
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
+262
+26.1pp
Medium lowest
+290
+13.4pp
Medium highest
+211
-25.5pp
Highest group
+222
-14.0pp
Data table
Individual income quartiles for Wundowie. Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Northam (S).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Northam (S)% | Count | % | Northam (S)% | Count | pp | |
| Lowest group | 262 | 26.1% | 27.1% | 0 | 0.0% | 24.3% | +262 | +26.1pp |
| Medium lowest | 293 | 29.2% | 29.6% | 3 | 15.8% | 29.2% | +290 | +13.4pp |
| Medium highest | 220 | 21.9% | 22.8% | 9 | 47.4% | 22.4% | +211 | -25.5pp |
| Highest group | 229 | 22.8% | 20.5% | 7 | 36.8% | 24.0% | +222 | -14.0pp |
| Total persons aged 15+ | 1,004 | 100.0% | 100.0% | 19 | 100.0% | 100.0% | +985 | 0.0pp |