Income
Individual Income Quartiles
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.
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 West Leederville, accounting for 47.2%.
Section overview
Individual income quartiles
West Leederville - Persons aged 15+ (Usual residence)
This table summarises individual income quartiles for West Leederville in 2021 for persons, with comparison against Cambridge (T) and change since 2016.
This area boundary has changed from 2016 to 2021. As a result, 2016 values are mapped onto 2021 suburb boundaries using ABS concordance.
Individual income quartiles snapshot
2021 distribution by category for West Leederville, with comparison markers for Cambridge (T).
Lowest group
Medium lowest
Medium highest
Highest group
Chart view
Individual income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
+49
-1.0pp
Medium lowest
+68
-0.5pp
Medium highest
+132
+1.3pp
Highest group
+232
+0.2pp
Data table
Individual Income Quartiles for West Leederville. Individual income quartiles. 2021 and 2016 counts, percentages, and change compared with Cambridge (T).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Cambridge (T)% | Count | % | Cambridge (T)% | Count | pp | |
| Lowest group | 556 | 16.3% | 21.4% | 507 | 17.3% | 21.7% | +49 | -1.0pp |
| Medium lowest | 584 | 17.1% | 17.0% | 516 | 17.6% | 15.7% | +68 | -0.5pp |
| Medium highest | 659 | 19.3% | 17.6% | 527 | 18.0% | 17.5% | +132 | +1.3pp |
| Highest group | 1,609 | 47.2% | 44.0% | 1,377 | 47.0% | 45.0% | +232 | +0.2pp |
| Total persons aged 15+ | 3,408 | 100.0% | 100.0% | 2,927 | 100.0% | 100.0% | +481 | 0.0pp |