Quality Statement

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Introduction

The quality of statistical data is often assessed through its 'fitness for purpose'. That is, an assessment of how well the data meets the needs of the user.

This quality statement provides information about the quality of the crime statistics presented using the dimensions of the Australian Bureau of Statistics (ABS) Data Quality Framework (Relevance, Timeliness, Accuracy, Coherence, Interpretability, and Accessibility), to assist with this assessment.

Relevance

Data is released for selected offence types (listed below) for the geographic regions of Western Australia (WA), Metropolitan Region, Regional WA Region and the 11 police districts.

A subset of the below selected offence types is available at suburb/locality level via the Crime Statistics suburb look up table.

Selected offence types are:

​ Homicide
  • Murder
  • Attempted/Conspiracy to Murder
  • Manslaughter
  • Driving Causing Death

Recent Sexual Offences

  • Recent Sexual Assault
  • Recent Non-Assaultive Sexual Offences

Historical Sexual Offences

  • Historical Sexual Assault
  • Historical Non-Assaultive Sexual Offences

Assault (Family)

  • Serious Assault (Family)
  • Common Assault (Family)

Assault (Non-Family)

  • Serious Assault (Non-Family)
  • Common Assault (Non-Family)
  • Assault Police Officer

Threatening Behaviour (Family)

  • Threatening Behaviour (Family)
  • Possess Weapon to Cause Fear (Family)

Threatening Behaviour (Non-Family)

  • Threatening Behaviour (Non-Family)
  • Possess Weapon to Cause Fear (Non-Family)

Deprivation of Liberty

  • Kidnapping/Child Stealing
  • Deprivation of Liberty

Robbery

  • Business
  • Non-Business

Burglary

  • Dwelling
  • Non-Dwelling

Stealing of Motor Vehicle

Stealing

  • Stealing From Motor Vehicle (Contents or Parts)
  • Stealing From Retail Premises (Shoplift)
  • Stealing From Dwelling
  • Stealing From Other Premises or Place
  • Stealing as a Servant
  • Stealing (Not Elsewhere Classified)

Property Damage

  • Criminal Damage
  • Damage

Arson

  • Cause Damage by Fire
  • Cause Bushfire
  • Other Fire Related Offences

Drug offences

  • Drug Dealing
  • Cultivate or Manufacture Drugs
  • Drug Possession
  • Possession of Drug Paraphernalia
  • Other Drug Offences

Receiving and Possession of Stolen Property

  • Possess Stolen Property
  • Receiving Stolen Property

Regulated Weapons Offences

Graffiti

Fraud and Related Offences

  • Forgery
  • Fraud (Credit Card)
  • Fraud (Not Elsewhere Classified)

Breach of Violence Restraint Order

  • Breach of Family Violence Restraint Order
  • Breach of Violence Restraint Order
  • Breach of Police Order

Timeliness

Data is compiled based on the date an offence is reported, or becomes known to police. It is released quarterly on the website at the end of the month that follows the quarter. (E.g. January – March data is released in the last week of April).

Accuracy

In 2016, the WA Police Force commissioned an independent review of its statistical processes by the ABS. The review focused on selected criminal offence data.

Based on the ABS recommendations, the WA Police Force implemented changes to its internal statistical processes between May and July 2017. As such, comparability of data published prior to this date should be undertaken with caution.

Offence data is extracted from a WA Police Force administrative system. The counting rules applied by the WA Police Force to offence counts are aligned where practicable with the National Crime Recording Standards to create the offence counts published by region and offence types.

For further detail please see the Explanatory Notes.

Due to ongoing police investigations, offence counts are subject to revision until incidents are finalised, which may result in minor changes to data for reported crime statistics between quarters.

Location data is recorded for all offences. However, if the location is unable to be mapped using the WA Police Force geographical mapping tables, the offence will appear in WA State level data, but not appear at lower geographical levels (i.e. Region, District, or Locality).

Coherence

The crime statistics supplied to the ABS are compiled according to the Australian and New Zealand Standard Offence Classification (ANZSOC), 2011 (cat. No. 1234.0). The exception to this is the category of Stealing of Motor Vehicle, which has a slightly broader definition according to WA Legislation compared to ANZSOC.

The offence classification used for the publishing of WA Police Force crime statistics is based on a combination of ANZSOC, WA Legislation, and operational reporting requirements.

Family relationship, for the classification of Family related offences, is defined by the WA Police Force as:

  • Partner;
  • Ex-partner;
  • Parents;
  • Guardians of children; and
  • Children who reside or regularly stay with involved parties.

Recording and Counting rules follow the National Crime Recording Standard (2008) from July 2017, noting that the standard relates to victim counts compared to the WA Police Force which counts criminal offences. Where the WA Police Force differs from the NCRS consultation has occurred with the ABS.

Interpretability

Explanatory material (Explanatory Notes, Glossary) has been provided on the WA Police Force website to assist users with understanding and interpreting the offence count statistics. Additional notes have been specified within the spreadsheets that are available for download from the WA Police Force website to also assist with interpreting the statistics.

Offence counts do not represent Victim or Offender counts. People can be Victims or Offenders on multiple offences.

For example, the stealing of a credit card and using it to purchase items over a period of time may lead to multiple offences of Fraud being recorded (and counted), but only one Victim and one Offender are associated with this offence (incident).

Accessibility

‘Year to Date Annual Crime Statistics’ provides a snapshot of selected offences and their rate per 100,000 people for the state of Western Australia (WA), the two Regions (Metropolitan and Regional WA) and each individual police district. This is released as a Portable Document Format (PDF).

A time series of selected offences from January 2007 onwards is available via spreadsheet for the state of Western Australia (WA), the two Regions (Metropolitan and Regional WA) and each individual police district.

The suburb/locality look up tool provides data for a reduced set of selected offences from January 2007, with three suburbs/localities able to be selected at once for comparison.