Is There an Allegiance Effect for Assessment Instruments? Actuarial Risk Assessment as an Exemplar
Article first published online: 23 OCT 2008
© 2008 American Psychological Association
Clinical Psychology: Science and Practice
Volume 15, Issue 4, pages 346–360, December 2008
How to Cite
Blair, P. R., Marcus, D. K. and Boccaccini, M. T. (2008), Is There an Allegiance Effect for Assessment Instruments? Actuarial Risk Assessment as an Exemplar. Clinical Psychology: Science and Practice, 15: 346–360. doi: 10.1111/j.1468-2850.2008.00147.x
- Issue published online: 23 OCT 2008
- Article first published online: 23 OCT 2008
- Received November 2, 2007; accepted February 13, 2008.
- allegiance effect;
- risk assessment;
The Violence Risk Appraisal Guide (Harris, Rice, & Quinsey, 1993), the Sex Offender Risk Appraisal Guide (Quinsey, Harris, Rice, & Cormier, 1998), and the Static-99 (Hanson & Thornton, 1999) are three well-researched risk measures. All three instruments were good predictors of recidivism (r = .31). However, these effect sizes were significantly larger in studies conducted by the instruments’ authors (r = .37) than in studies conducted by independent researchers (r = .28). This allegiance effect remained significant even when the initial validation studies were excluded. No other design or sample characteristics were significant moderators of the relation between scores and recidivism. These findings raise questions about whether such an allegiance effect may be found for other measures.