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The specific reporting framework used to collect statistics can significantly alter the resulting crime counts. In the Summary Reporting System (SRS), a hierarchy rule is applied that only counts the most serious crime in incidents involving multiple offenses. In contrast, the National Incident-Based Reporting System (NIBRS) captures more detailed data without applying this hierarchy rule. Because of these structural differences, the FBI advises that NIBRS data should not be directly compared to SRS-derived publications like Crime in the United States.
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