Risks of life on the street caused by inclement weather, harassment, and assault threaten the unsheltered homeless population. We address some challenges of enumerating the street homeless population by testing a novel capture-recapture (CR) estimation approach that models individuals' intermittent daytime visibility. We tested walking and…

Discusses problems of classifying racial and ethnic groups when collecting statistical data. Argues that surveys must acknowledge the great diversity of the American population and give respondents the freedom to choose the group or groups to which they belong. (FMW)

Reviews several potential problems that often invalidate statistical tests of social theories. Discusses how there may be very serious identification problems in the estimation of the relationship between executions and homicides, and that serious questions may be raised regarding the validity of any particular estimation of this relationship.…

This project was part of the Portland High Impact Program and had as its goal a 60 percent reduction in burglary losses over a three-year period to be attained by installing centrally-monitored, silent, anti-intrusion devices in eleven schools. Comparison with eleven control schools indicates that the alarm system has demonstrated effectiveness in…