Advances in violence and trauma: toward comprehensive ecological models.

The most important things learned about violence and trauma in the past 20 years are that interpersonal violence is prevalent, with different forms co-occurring, and that victims' reactions are complex. Researchers are called to consider models that include the ecological context within which victims experience violence and trauma to gain a better understanding of the variation seen in psychological outcomes. Multivariate data-analytic techniques such as structural equation modeling and cluster analysis are suggested as promising ways to explore questions framed by comprehensive models.