Journal of Health Care for the Poor and Underserved volume 20, issue 4, P1124-1141 2009 DOI: 10.1353/hpu.0.0227 View full text
William P. Brandon, Rajeshwari Sundaram, Ashley A. Dunham

Abstract: This case study (n=41,969) aims to discover managerially useful predictors of multiple switching among HMOs in a Medicaid managed care population observed over 33 months. Cox's proportional hazards model was used to analyze eligibility data for the entire population, claims data for Medicaid services received during six months prior to HMO enrollment (sample n=2,474) and telephone interviews (sample n=656). Each analytic stage involved four comparisons: (1) enrollees with one switch compared with enrollees wit…

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