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Calculation of crime severity index (CSI) by Statistics Canada:
“The Crime Severity Index (CSI) measures changes in the level of severity of crime in Canada from year to year. In the index, all crimes are assigned a weight based on their seriousness. The level of seriousness is based on actual sentences handed down by the courts in all provinces and territories. More serious crimes are assigned higher weights, less serious offences lower weights. As a result, more serious offences have a greater impact on changes in the index. The PRCSI is standardized to 100 in base year 2006. CSI weights are updated using data from the Integrated Criminal Courts Survey (ICCS) every 5 years. 2017 marks the second update to the CSI weights since 1998. 2016 revised and 2017 CSI data are presented here using the updated weights and may have a marginal impact on the CSI data itself.”
“A high crime rate or Crime Severity Index (CSI) may indicate that a municipality is a geographical area that provides commercial business, human or public services, or entertainment for many people who reside outside, as well as inside, the municipality. As a result, these municipalities may have large part-time or temporary populations which are excluded from both their population bases and their crime rate and CSI calculations.”
Further reading:
Misrepresenting the data on crime. John Howard Society 2023.
Crime statistics in Canada 2025 The World Data – Insights HubCalculation of crime severity index (CSI) by Statistics Canada:
