The introduction of the revised offence classification has had limited direct impact on offence data, however, during the course of the revised classification being implemented jurisdictions also rectified a number of local offence codes that were miscoded to ASOC in previous years, thus impacting on data comparability between 2009 and prior years for certain offence codes. This has primarily affected the offence category of other theft for a number of jurisdictions, and has had a significant impact on the assault data for Victoria. For further details refer to the Technical Note on page 96.
A more widespread impact is associated with changes resulting from the NCRS. For 2009, victim counts exclude outcomes of investigations that have been determined as 'no crime' for all jurisdictions, except the Northern Territory. Prior to 2009 these counts were included for most jurisdictions, therefore movements in data between these two years will largely show a reduction of victim counts for most offence types when compared to data for 2008. Data were not able to be revised for years prior to 2009. Nationally 'no crime' accounted for less than 1% to 11% of victim counts for the various published offence types. All but one offence type had less than 5% of records classified as 'no crime'. Queensland data are not impacted as these outcomes were not included in prior years. Due to systems issues, data for the Northern Territory continues to include these outcomes. For further details on the impact of removing outcomes of investigations classified as 'no crime', refer to the Technical Note on page 96.
As data have not been revised to take account of these business process changes prior to 2009, caution should be exercised when comparing movements between 2009 data and earlier reference periods in the published tables as the difference may not reflect 'actual' movements. The Technical Note identifies 'actual' movements where it has been possible to derive this, and readers are referred to page 96 for further information to assist in interpreting data movements.