Exhibit 1: Sources of Data Used in 44 Analyzed Studies on Mass Shootings

Sources of Data: Secondary News Data = 65%, Official Records =44%, and Interview = 2% — NIJ (see reuse policy).

Description

From the article "Advancing Mass Shooting Research To Inform Practice," April 6, 2020.

Secondary data comprises news accounts, literature, previous research data sets, monographs, books, advocacy groups, international sources, press data sets, internet, and other sources. Official records come from the Federal Bureau of Investigation’s (FBI) Supplementary Homicide Reports (SHR), Uniform Crime Reports (UCR), National Incident-Based Reporting System (NIBRS), and other FBI sources; the Bureau of Justice Statistics (BJS); the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF); the Central Intelligence Agency’s (CIA) World Fact Book (WFB); the U.S. Department of Education’s (ED) National Center for Education Statistics (NCES); the New York Police Department (NYPD) and other police records; courts; and other sources.

Source: Basia E. Lopez, Danielle M. Crimmins, and Paul A. Haskins, "Advancing Mass Shooting Research To Inform Practice," April 6, 2020, nij.ojp.gov:
https://nij.ojp.gov/topics/articles/advancing-mass-shooting-research-inform-practice