Counting Rules
Definition
Administrative instructions that specify how agencies should convert incidents into statistical records: how to count multiple victims of one incident, how to classify ambiguous offences, and how to handle series crimes. Changes to counting rules are a major cause of apparent trend shifts that do not reflect real changes in crime.
- Function
- Standardise incident-to-record conversion for crime statistics
- Covers
- Multiple victims, ambiguous offence classification, series crimes
- Main effect on trends
- Rule changes can produce apparent crime rises or falls with no real change
Common questions
Why do counting rule changes distort year-on-year crime comparisons?+
If an agency changes how it counts, for example moving from counting one record per incident to one record per victim, the raw totals shift even though nothing changed in actual offending. Analysts comparing years across such a change without adjusting for the rule change will read a real trend where there is only a bookkeeping artefact.
How do the Hierarchy Rule and the Hotel Rule illustrate different counting approaches?+
Under a hierarchy rule, a multi-offence incident is recorded only under its most serious offence, undercounting lesser crimes in the same event. Under approaches that count every offence and every victim separately, the same incident can generate several records, so totals under the two systems are not directly comparable.
Related terms
- Attrition
- The progressive loss of cases as they move through the criminal justice system: from crime committed, to reported, to recorded, to prosecuted,...
- Notifiable Offences
- In England and Wales, the category of offences that must be formally reported to the Home Office and included in national crime...
- Police-Recorded Crime
- Criminal incidents formally logged by police following a report or officer discovery, counted according to nationally defined rules and submitted to a...
- Reporting Rate
- The proportion of crimes experienced by victims that are brought to the attention of police. Reporting rates vary substantially by offence type,...
- Secondary Victimisation
- Additional harm caused to a victim through the process of reporting and investigation, such as disbelief, insensitive questioning, or retraumatisation. Fear of...