- Violent Deaths
- Nonfatal Student and Teacher Victimization
- School Environment
- Violent and Other Criminal Incidents at Public Schools, and Those Reported to the Police
- Discipline Problems Reported by Public Schools
- Students' Reports of Gangs at School
- Illegal Drug Availability and Drug-Related Discipline Incidents
- Students' Reports of Being Called Hate-Related Words and Seeing Hate-Related Graffiti
- Bullying at School and Cyberbullying Anywhere
- Teachers' Reports on School Conditions
- Fights, Weapons, and Illegal Substances
- Fear and Avoidance
- Discipline, Safety, and Security Measures
- Postsecondary Campus Safety and Security
Appendix A: Technical Notes
The indicators in this report are based on information drawn from a variety of independent data sources, including national and international surveys of students, teachers, principals, and postsecondary institutions, and data collection from federal departments and agencies and international organizations, including the Bureau of Justice Statistics, the National Center for Education Statistics, the Federal Bureau of Investigation, the Centers for Disease Control and Prevention, the Office of Postsecondary Education, and the Organization for Economic Cooperation and Development. Each data source has an independent sample design, data collection method, and questionnaire design or is the result of a universe data collection. Universe data collections include a census of all known entities in a specific universe (e.g., all deaths occurring on school property). Readers should be cautious when comparing data from different sources. Differences in sampling procedures, populations, time periods, and question phrasing can all affect the comparability of results. For example, some questions from different surveys may appear the same, but were asked of different populations of students (e.g., students ages 12–18 or students in grades 9–12); in different years; about experiences that occurred within different periods of time (e.g., in the past 30 days or during the past 12 months); or at different locations (e.g., in school or anywhere).
Findings described in this report with comparative language (e.g., higher, lower, increase, and decrease) are statistically significant at the .05 level. The primary test procedure used in this report was Student's t statistic, which tests the difference between two sample estimates. The t test formula was not adjusted for multiple comparisons. Estimates displayed in the text, figures, and tables are rounded from original estimates, not from a series of rounding.
The following is a description of data sources, accuracy of estimates, and statistical procedures used in this report.