Explanatory Notes


Cautionary Note:

The crime statistics published in Crime Mapper may not provide an accurate measure of the prevalence or incidence of crime in the community due to the following reasons:


The annual crime statistics reflected in Crime Mapper may not always be comparable due to the following reasons:


The potential influence of all of these factors on recorded crime statistics should be taken into consideration when interpreting the statistics contained in Crime Mapper.

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Recorded Crime Statistics:

When an incident is reported or becomes known to police, a police incident report is made. Normally, there is one incident report per victim. Each police incident report may contain more than one offence or more than one count of the same offence.

Crime Mapper counts all offences and all counts of the same offence listed on all police incident reports filed within the reporting year (i.e., all offences reported or becoming known to police).

Recorded offences with an unknown location are included in the South Australia-wide profile but are excluded from the Metropolitan, Regional and Local Government Area (LGA) profiles. The number of offences with unknown location are small in comparison to the total. For example, in 2012 the number of offences with an unknown location was 97. This represented less than 0.1 percent (0.05%) of all offences reported or becoming known to police.

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Recorded Offence Categories:

Recorded offences have been grouped into eight major offence categories. These groups correspond to the JANCO classification system. JANCO is an adaptation of the ANCO classification system (Australian Bureau of Statistics (ABS), Australian National Classification of Offences, 1985, Cat. no. 1234.0). JANCO adheres to the most detailed level of ANCO and extends this to even more detailed levels to highlight items of interest obscured by the generality of ANCO and to ensure it reflects South Australian law.

Each JANCO classification level generally contains a number of offences of the same type that may be located in either State and/or Commonwealth legislation.

Further information regarding the counting rules used in Crime Mapper can be obtained from the Office of Crime Statistics and Research.

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Data Interpretation:

When using Crime Mapper statistics, the following should be taken into consideration:

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Data Sources:

The crime statistics published in Crime Mapper are based on data supplied by South Australia Police. Expiable offences (e.g. some driving offences) are not included.

Estimated Residential Population figures are sourced from the publication Regional Population Growth (ABS, Cat. no. 3218.0).

Geographical boundaries for Crime Mapper 2009-2013 are sourced from the Australian Statistical Geography Standard (ASGS) (ABS, Cat. no. 1270.0.55.001).

Geographical boundaries for previous releases of Crime Mapper were sourced from the Australian Standard Geographical Classification (ASGC) (ABS, Cat. no. 1216.0).

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Citing Crime Mapper:

When citing Crime Mapper, it is important to refer as closely as possible to the version of Crime Mapper and the table(s) used.

The Office of Crime Statistics and Research (OCSAR) suggests the following citations:

In-text:
(OCSAR, [year])

For example:
(OCSAR, 2015)

In the reference list/ bibliography:
Office of Crime Statistics and Research, [year], Crime Mapper [version], [Geographical Area], [Table title], viewed [DD Month YYYY], <Electronic link/URL>

For example:
Office of Crime Statistics and Research, 2015, Crime Mapper 2009-2013, Adelaide (C) Local Government Area, Rate per 1,000 population of offences recorded by police, viewed 15 May 2015, <http://www.ocsar.sa.gov.au/region_files/LGA%20Adelaide%20(C).html>

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Differences between versions of Crime Mapper:

Changes to the definitions of Metropolitan South Australia and Regional South Australia for Crime Mapper 2009-2013

The definition of Metropolitan South Australia used for Crime Mapper has changed for the 2009-2013 release. Previously, Metropolitan South Australia referred to the Adelaide Statistical Division as defined by the ASGC (ABS, Cat. no. 1216.0). Due to changes to the geographical boundaries in the ASGS (ABS, Cat. no. 1270.0.55.001), Crime Mapper now defines Metropolitan South Australia as the sum of all LGAs that previously fell within the Adelaide Statistical Division whether in total or in part.

The Adelaide Statistical Division divides the Adelaide Hills LGA into two parts resulting in this LGA only partially being included in the definition of Metropolitan South Australia for previous versions of Crime Mapper.

Figure 1 shows the Adelaide Statistical Division by Statistical Local Area. The area shaded in blue is the part of the Adelaide Hills LGA that is included in the Adelaide Statistical Division.

Figure 1. Adelaide Statistical Division by Statistical Local Area
Adelaide Statistical Division - SLAs Alt Image

Figure 2 shows the LGAs that are fully or partially included in the Adelaide Statistical Division by LGA. Highlighted in yellow is the part of the Adelaide Hills LGA that is not included in the Adelaide Statistical Division and hence excluded from previous versions of Crime Mapper. As with Figure 1, the area shaded in blue is the part of the Adelaide Hills LGA that was included in the definition of Metropolitan South Australia for previous versions of Crime Mapper.

Figure 2. Adelaide Statistical Division by Local Government Area Adelaide Statistical Division - LGAs showing Adelaide Hills split Alt Image

The new definition of Metropolitan South Australia now includes the following LGAs:


Recalculation of population figures for 2007-2011 and 2009-2013

Crime Mapper rates per 1,000 population are calculated based on the Estimated Residential Population (ERP) figures published in Regional Population Growth (ABS, Cat. no. 3218.0). In July 2012, the ABS published recalculated (rebased) ERPs for the years 2007 to 2010, based on population figures from the 2011 census. As a result, the ERPs used in Crime Mapper 2007-2011 and 2009-2013 (and hence rates per 1,000 population) are slightly different to those used in Crime Mapper 2006-2010.

For further information on the ABS rebased population figures see the Quality Declaration for Regional Population Growth (ABS, Cat. no. 3218.0)


2006-2010 modifications

In response to user feedback, the following enhancements were made to Crime Mapper 2006-2010:

  1. The addition of recorded crime profiles for:

    1. South Australia
    2. Metropolitan South Australia1; and
    3. Regional South Australia2

  2. The addition of downloadable excel spreadsheets and printer-friendly data sheets.

1 For all versions of Crime Mapper up to and including Crime Mapper 2007-2011, Metropolitan South Australia refers to the Adelaide Statistical Division as defined by the Australian Bureau of Statistics' Australian Standard Geographical Classification (ABS, Cat. no. 1216.0).

2 Regional South Australia refers to all areas of South Australia outside of Metropolitan South Australia.

2005-2009 modifications

Due to software incompatibilities associated with the original version of Crime Mapper, OCSAR redeveloped Crime Mapper to enable access by Windows Vista or 7 users. Crime Mapper 2005-2009 was the first release to utilise the new format.

Similarities:

This version of Crime Mapper applied the same recorded offence counting rules (see Recorded Crime Statistics) and recorded offence categories (see Recorded Offence Categories) as the original version. In this way, recorded offence data presented in the new format is consistent with data presented in the original format.

Key enhancements:

The new format offered the following enhancements to Crime Mapper:

Differences:

The main formatting change to Crime Mapper related to the colour coding of the maps. In the original version, the colours shown on the maps represented the ranking of LGAs based on recorded offence numbers or rate per 1,000 population compared with other LGAs. They did not represent changes in recorded crime over time for each LGA. This was not always clear to users.

The original version of Crime Mapper used an XML-based technology called Scalable Vector Graphics (SVG). Adobe have stopped development of this plugin. There is no version of the plugin for Internet Explorer running on Windows Vista or 7. Consequently Windows Vista or 7 users were unable to view the original version of Crime Mapper.

Recorded offence data according to Statistical Local Area is not provided in the current version of Crime Mapper.

Due to changes in the presentation of data, percentage change calculations can now be undertaken by users.

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Feedback:

OCSAR aims to continually improve its statistical products. We encourage you to email us your feedback.

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