Income
Household income quartiles
About this topic
Household income quartiles group households into four evenly sized income ranges so relative income position can be compared across places and across Census years. They provide a distribution view of household income rather than a simple count in fixed dollar brackets.
This topic is useful because raw household income amounts are influenced by inflation and broader economic shifts. Quartiles make it easier to see whether an area's households are concentrated toward lower, middle, or higher income positions over time.
Interpretation notes
- This is a derived distribution of total household income, so each quartile shows relative position rather than a fixed income bracket.
- It is useful for over-time comparison because quartile groupings are less distorted by inflation than raw dollar bands.
Key insight
In 2021, the highest household income quartile held the largest share among households with income in Secret Harbour, accounting for 38.1%.
Section overview
Household income quartiles
Secret Harbour - Households (Enumerated)
This table summarises household income quartiles for Secret Harbour in 2021 for persons, with comparison against Rockingham (C) and change since 2016.
Household income quartiles snapshot
2021 distribution by category for Secret Harbour, with comparison markers for Rockingham (C).
Lowest group
2021 count
444
% of total
13.3%
Change from 2016
-
444
13.3%
-
Medium lowest
2021 count
607
% of total
18.1%
Change from 2016
-
607
18.1%
-
Medium highest
2021 count
1,019
% of total
30.5%
Change from 2016
-
1,019
30.5%
-
Highest group
2021 count
1,275
% of total
38.1%
Change from 2016
-
1,275
38.1%
-
Chart view
Household income quartiles change
Absolute change in category counts between 2016 and 2021.
Lowest group
-
-
Medium lowest
-
-
Medium highest
-
-
Highest group
-
-
Data table
Household income quartiles for Secret Harbour. Household 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 | 444 | 13.3% | 25.9% | 356 | 12.1% | 25.6% | - | - |
| Medium lowest | 607 | 18.1% | 26.0% | 538 | 18.3% | 25.6% | - | - |
| Medium highest | 1,019 | 30.5% | 26.6% | 909 | 30.9% | 27.0% | - | - |
| Highest group | 1,275 | 38.1% | 21.5% | 1,138 | 38.7% | 21.9% | - | - |
| Total Households | 3,345 | 100.0% | 100.0% | 2,941 | 100.0% | 100.0% | - | - |