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Chapter 9 Special Purpose ASGC Codes
PURPOSE
To allow data to be coded when only incomplete locational information is available, a series of special purpose codes has been created for each hierarchical level within the ASGC’s Main Structure and for SRs within the SR Structure. These codes are used when people provide limited address details or have no fixed place of abode.
Special purpose codes enable data to be coded to the broadest hierarchical level reported. For example, a reported address may be sufficiently detailed to allow it to be coded to a Capital City SD within a S/T, even though it cannot be coded to an SSD within that Capital City SD.
Coding data to a higher level unit in a hierarchical classification without also coding it to the lower levels would cause the data value for the higher unit to no longer equal the sum of data values for the lower units. Special purpose (i.e. dummy area) codes have therefore been created for each hierarchical level in the Main Structure and for SRs within the SR Structure, to which geographically undefined data can be classified.
MAIN STRUCTURE
In the Main Structure special purpose codes relate to, in ascending hierarchical order: SLAs, SSDs, SDs and S/Ts.
Special purpose SLA codes
Four-digit SLA codes ending with 99 are reserved for coding undefined area data to SLA level. The first two digits of undefined SLA codes are normally in the range 00-89.
Example:
| 0199 | Greater Hobart Undefined |
| 1399 | Lyell Undefined |
Information required to be coded at SLA level but only able to be coded at SSD level, is coded to the undefined SLA within the defined SSD.
Example:
| SD | SSD | SLA |  |
| 20 | | | Mersey-Lyell |
| 15 | | Lyell |
| | 1399 | Lyell Undefined |
Information required to be coded at SLA level but only able to be coded at SD level, is coded to the undefined SLA of the undefined SSD within the defined SD.
Example:
| SD | SSD | SLA | |
| 05 | | | Sydney |
| 88 | | Sydney Undefined |
| | 0099 | Sydney Undefined |
A number of SLA codes within the range 0099-9999 are reserved for specific applications.
- Code 0099 is reserved for the undefined SLA in each capital city SD.
Example:
| S/T | SD | SSD | SLA | |
| 1 | 05 | 88 | 0099 | Sydney Undefined |
- Code 9899 is reserved for the undefined SLA within an undefined SD, within a defined S/T. For example, when information is required to be coded at SLA level but is only able to be coded at the S/T level, it is coded to SLA 9899.
Example:
| S/T | SD | SSD | SLA | |
| 1 | 88 | 88 | 9899 | New South Wales Undefined |
| 8 | 88 | 88 | 9899 | Australian Capital Territory Undefined |
- Code 9099 is reserved for the undefined SLA within an undefined SD, within an undefined S/T . For example, when information is required to be coded at SLA level but is only able to be coded at the Australia level, it is coded to SLA 9099. This code is used to code Population Census data when usual residence information is not stated.
Example:
| S/T | SD | SSD | SLA | |
| 0 | 88 | 88 | 9099 | S/T Undefined, Not Stated for census purposes |
- Code 9199 is used in ‘usual residence’ and similarly worded coding where the information is not applicable (e.g. children who had not been born five years ago).
Example:
| S/T | SD | SSD | SLA | |
| 1 | 88 | 88 | 9199 | New South Wales, Not Applicable |
- Code 9299 is used in usual residence and similarly worded coding when the information relates to overseas.
Example:
| S/T | SD | SSD | SLA | |
| 3 | 88 | 88 | 9299 | Queensland, Overseas |
- Code 9399 is used as a dummy LGA to enable S/T totals to be produced for some LGA output from the Censuses of Population and Housing. In such circumstances, code 9399 equates to the aggregated unincorporated SLAs in each S/T.
Example:
| S/T | LGA | |
| 7 | 9399 | Northern Territory, Aggregation of unincorporated SLAs |
- Code 9499 is used for persons with no fixed place of abode, including children in care, persons in prison etc.
Example:
| S/T | SD | SSD | SLA | |
| 4 | 88 | 88 | 9499 | South Australia, No fixed abode |
Special purpose SD and SSD codes
The two-digit code 88 is reserved for coding undefined area information to SSD and SD levels. A dummy SD, with an SD code of 88, exists for every S/T in the Main Structure, except Other Territories. Similarly there is a dummy SSD for every SD, except for Other Territories.
Example:
| S/T | SD | SSD | |
| 1 | | | New South Wales |
| 88 | | New South Wales Undefined |
| 05 | | Sydney |
| | 88 | Sydney Undefined |
Special purpose S/T code
Information is coded to S/T Undefined when address details specify Australia only (i.e. without S/T details). The S/T code for S/T Undefined is 0. This code is also used to code Population Census data when usual residence is not stated.
Example:
| S/T | SD | SSD | SLA | |
| 0 | 88 | 88 | 9099 | S/T Undefined or for Population Census purposes - Not stated |
STATISTICAL REGION STRUCTURE
In the SR Structure, special purpose codes relate to SLAs, SRs and S/Ts.
Special purpose SLA codes
See above.
Special purpose SR codes
In New South Wales, Victoria, Queensland, South Australia and Western Australia, the two-digit code 98 is reserved for coding undefined area data to the SR level.
Example:
| S/T | SR | SLA | |
| 5 | 98 | 9899 | Western Australia Undefined |
In the remaining S/Ts (Tasmania, Northern Territory, Australian Capital Territory, Other Territories) there is only one SR, so undefined SR level information is coded to an undefined SLA within each S/T’s one defined SR (code 04).
Example:
| S/T | SR | SLA | |
| 8 | 04 | 9899 | Australian Capital Territory Undefined |
Special purpose S/T code
See Special purpose S/T code above.
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