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The Index of Household Advantage and Disadvantage (IHAD) provides a summary measure of relative socio-economic advantage and disadvantage for households, based on the characteristics of dwellings and the people living within them, using 2021 Census data.
All in-scope households are ordered from lowest to highest score. A low score indicates relatively greater disadvantage and a lack of advantage in general. A high score indicates a relative lack of disadvantage and greater advantage in general.
This dataset presents IHAD data in quartiles. The lowest 25% of households are given a quartile number of 1, the next lowest 25% of households are given a quartile number of 2 and so on, up to the highest 25% of households which are given a quartile number of 4. This means that households are divided into four equal sized groups, depending on their score. In practice these groups won’t each be exactly 25% of households as it depends on the distribution of the IHAD scores. The data is grouped by Statistical Area Level 1 (SA1 2021). SA1s are defined by the Australian Statistical Geography Standard (ASGS) Edition 3.
Key Attributes:
| Field alias | Field name | Description |
| Statistical Areas Level 1 2021 code | SA1_CODE_2021 | 2021 Statistical Areas Level 1 (SA1) codes from the Australian Statistical Geography Standard (ASGS), Edition 3. SA1s are designed to maximise the geographic detail available for Census of Population and Housing data while maintaining confidentiality. |
| Statistical Areas Level 1 2021 name | SA1_NAME_2021 | 2021 Statistical Areas Level 1 (SA1) names from the Australian Statistical Geography Standard (ASGS), Edition 3. SA1s are designed to maximise the geographic detail available for Census of Population and Housing data while maintaining confidentiality. |
| Area in square kilometres | AREA_ALBERS_SQKM | The area of a region in square kilometres, based on the Albers equal area conic projection. |
| Uniform Resource Identifier | ASGS_LOCI_URI_2021 | A uniform resource identifier can be used in web linked applications for data integration. |
| IHAD quartile 1 | IHAD_QUARTILE1 | Proportion of in-scope dwellings in the SA1 that fall into IHAD quartile 1, indicating relatively greater disadvantage and lack of advantage in general. |
| IHAD quartile 2 | IHAD_QUARTILE2 | Proportion of in-scope dwellings in the SA1 that fall into IHAD quartile 2. |
| IHAD quartile 3 | IHAD_QUARTILE3 | Proportion of in-scope dwellings in the SA1 that fall into IHAD quartile 3. |
| IHAD quartile 4 | IHAD_QUARTILE4 | Proportion of in-scope dwellings in the SA1 that fall into IHAD quartile 4, indicating a relative lack of disadvantage and greater advantage in general. |
| Occupied private dwellings | OPD_2021 | Dwellings in-scope of the IHAD i.e. classifiable occupied private dwellings. |
| SEIFA IRSAD quartile | IRSAD_QUARTILE | Index of Relative Socio-economic Advantage and Disadvantage quartile. All SA1s are ordered from lowest to highest score, the lowest 25% of SA1s are given a quartile number of 1, the next lowest 25% of SA1s are given a quartile number of 2 and so on, up to the highest 25% of SA1s which are given a quartile number of 4. This means that SA1s are divided into four equal sized groups, depending on their score. In practice these groups won’t each be exactly 25% of SA1s as it depends on the distribution of SEIFA scores. |
| Usual resident population | URP_2021 | Population counts in this column are based on place of usual residence as reported on Census Night. These include persons out of scope of the IHAD. |
| Dwellings | DWELLING | Total dwellings at Census time, including dwellings out of scope of the IHAD e.g. unoccupied private dwellings. |
Data and geography references
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