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Deadly Lessons: Understanding Lethal School Violence
one another, with one rising after the other rises, or one falling while some other component rises. It is quite possible that this form of violence moves independently of other forms of violence, just as the level of domestic homicide or gangland murders seems to move somewhat independently of homicides in general.
The difference between the numbers of events in these two periods would be significant in any probability model constructed to test whether the number of student school rampages increased. However, the issue of statistical significance is not directly relevant here, as we have a census of the events. As a descriptive matter, there is little doubt that the number of student school rampages increased over time.
SHR victim data were weighted to match national FBI Uniform Crime Reports estimates of homicide victimization.
SHR offender data are limited by missing offender data associated with unsolved homicides. The estimates reported here use an imputation algorithm made available with the SHR computer file that provides estimates for these unsolved homicides based on the characteristics (age, race, and sex) of offenders associated with solved homicides (see Fox, 2001).
These events included homicides, suicides, legal intervention, or unintentional firearm-related related death of a student or nonstudent in which the fatal injury occurred (1) on the campus of a public or private elementary or secondary school, (2) while the victim was on the way to or from such a school, or (3) while the victim was attending or traveling to or from an official school-sponsored event (Anderson et al., 2001).