Assessing the Effect of Batterer Program Completion on Reassault: An Instrumental Variables Analysis

The main objective of this paper is to investigate the utility of using the instrumental variables (IV) method to estimate batterer program efficacy, i.e., the program effect among batterers who complete batterer programs. This method takes account of possible confounding due to unmeasured traits of compliers and non-compliers. A structural model is used to estimate the impact of program completion on reassault using instrumental variables (IV) regression. Data on 640 batterers enrolled at three batterer programs are used. Results obtained from IV regression are compared with those obtained from a more traditional regression analysis. The results indicate that usual regression methods yield estimates of program effect that may be biased due to confounding by unmeasured batterer characteristics. Unfortunately, IV estimates may be unreliable due to failure of some of the assumptions on which they are based. If equations are adequately identified by the non-linear functional form used to estimate them, then IV results indicate that among a very select group of batterers, program completion significantly reduces the probability of reassault. The implications of confounding due to program non-compliance, program non-enrollment and attrition for future evaluations of batterer programs are discussed.     

Who ‘Tweets’ Where and When,and How Does it Help Understand Crime Rates at Places? Measuring the Presence of Tourists and Commuters in Ambient Populations

Journal of Quantitative Criminology - Test the reliability of geotagged Twitter data for estimating block-level population metrics across place types. Evaluate whether the proportion of Twitter...     

Psychosocial Consequences of Intimate Partner Violence (IPV) Exposure in Maltreated Adolescents: Assessing More than IPV Occurrence

The majority of research on the psychosocial impact of intimate partner violence (IPV) exposure for children has focused on IPV occurrence. The current study extended this research by examining three dimensions of IPV exposure: frequency, proximity, and severity, and tested whether these dimensions predicted variance in adolescents’ psychosocial problems over-and-above that accounted for by IPV occurrence. Participants included 140 adolescents and their caregivers, who were recruited for an intervention involving maltreated youth placed in out-of-home care. After controlling for IPV occurrence, exposure to community violence, and severity of maltreatment, results indicated a positive association between the multidimensional IPV index and youth report of psychosocial problems. There was also a trend for a positive association between the IPV index and caregiver report of psychosocial problems for boys. The study’s results are discussed in terms of their implications for prevention researchers and child welfare agencies.