Understanding AEDC community boundaries
AEDC geographic boundaries are defined for the whole country to ensure that the data is reported in the most useful way possible, but still align with commonly understood geography, such as suburbs. Those boundaries enable AEDC results to be reported at four different geographic levels: Local Community, Community, State/Territory and National*.
AEDC Communities and Local Communities
AEDC Local Communities represent the smallest geographic areas. In most cases, AEDC Local Community boundaries are equivalent to suburbs. The next largest geographic areas are AEDC Communities. In most cases, AEDC Community boundaries are equivalent to local government areas. However, the name of a local government area may not always match the name of an AEDC Community.
A geographic area made up of AEDC Local Communities, usually a region’s local government area.
AEDC Local Community
A small area locality within an AEDC Community, usually a suburb.
Changes to the AEDC geography
The AEDC geography was updated in order to match the new Australian Statistical Geography Standard (ASGS) released by the Australian Bureau of Statistics (ABS) in 2011.
Revised boundaries were used for the 2015 collection and applied retrospectively to the 2009 and 2012 collections in order to allow trend analysis over all three cycles. Individual children in each collection were assigned to a revised local community and the AEDC publishing rules (suppressions) were reapplied to the resulting data. This means that the data may have changed for some communities.
Many 2015 Local Communities and Communities have the same name as in 2009 and 2012 even though the geographical area covered has changed. As a result, in many cases, scores for Local Communities and Communities will be different from previously published AEDC data.
In order to allow accurate comparison of AEDC and socio demographic data from the ABS, the AEDC boundaries were brought into alignment with the SA1 (Statistical Area 1) building blocks. The Local Community boundaries were kept as similar to the 2012 boundaries as possible, however when Local Community boundaries have been altered, consideration has been given to population, geography, socioeconomic status and service provision. Any changes to boundaries have been made following consultation and advice from state and territory governments and, where possible, community representatives.
Please see the ABS website for more information on ASGS.
Criteria for releasing results
It is imperative that the confidentiality of children and the reliability of the data is maintained. Therefore, domain results can only be reported when a minimum of 15 children with valid scores and two teachers have contributed to the data collection.
Scores are flagged as invalid and not reported for children who have been in the class for less than one month, are less than four or over seven years old or where teachers complete less than 75 per cent of the items in any given domain.
Communities and Local Communities must have valid domain scores for at least eighty per cent of the overall number of instruments completed. This is to ensure the results appropriately reflect the community.
Reported results include demographic data for all children included in the AEDC. Domain scores are reported only from children with valid scores, and for those who do not have any diagnosed special need.
Searching for Communities
Use the AEDC Data Explorer to search for Communities and Local Communities.
Comparison of previous AEDC results
Previous AEDC collection data has been aligned to the new geography with some marginal changes to the AEDC boundaries anticipated for the next collection. This is to ensure that the AEDC geography is closely aligned with the ASGS and allow for AEDC Community results to be compared over time alongside ABS data.
To assist in making informed decisions on whether there has been a large enough change in the percentage of children considered developmentally on track, at risk or vulnerable over time to be considered significant, a method described as the critical difference has been developed.
To compare changes over time for your Community and Local Community, use the ‘compare years’ function on the AEDC Data Explorer, which automatically calculates the critical difference and indicates whether a change is significant or not for your search area.
For more information on the calculation of the critical difference, refer to the AEDC technical report - Calculation of the Critical Difference.
*AEDC data is also available at LGA, SLA and SA2 level as public tables via the AEDC website.
This is an updated HTML version version of the former AEDI resource Fact Sheet on Understanding Community Boundaries.
Document stock code: AEDC-1604-001-1