1. American Academy of Actuaries. 2010. Issue brief: Risk assessment and risk adjustment. May 2010. http://www.actuary.org/pdf/health/Risk_Adjustment_Issue_Brief_Final_5-26-10.pdf. Accessed 7 Feb 2012.
2. Ash, A.S., F. Porell, L. Gruenberg, et al. 1989. Adjusting medicare capitation payments using prior hospitalization data. Health Care Financing Review 10(4): 17–29.
3. Ash, A.S., R.P. Ellis, G.C. Pope, J.Z. Ayanian, D.W. Bates, H. Burstin, L.I. Iezzoni, E. McKay, and W. Yu. 2000. Using diagnoses to describe populations and predict costs. Health Care Financing Review 21(3): 7–28.
4. Averill, R.F., N.I. Goldfield, J. Eisenhandler, J.S. Hughes, B.V. Shafir, and D.E. Gannon, et al. 1999. Development and evaluation of clinical risk groups (CRGs), 3M health information systems. Wallingford.
5. Basu, A., W.G. Manning, and J. Mullahy. 2004. Comparing alternative models: Log vs. Cox proportional hazard. Health Economics 13: 749–765.