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Index/Topics/Database comparison challenges

Database comparison challenges

The difficulties in comparing mass shooting datasets due to differing inclusion rules and definitions

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Jan 9, 2026

How did mass shooting rates change year-by-year during Trump's presidency (2017–2020)?

Mass-shooting counts reported by major trackers generally rose across 2017–2019 and then jumped sharply in 2020, but the magnitude and year-to-year picture depend heavily on which database and definit...

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