Health Plan Choice and the Utilization of Health Care Services
研究健康计划会员身份对医疗服务利用的影响，利用非实验数据解决零值比例高的问题，发现控制慢性病等变量后无选择性偏差，估计结果与实验数据相似。
The effect of health-plan membership on the utilization of health-care services is of interest to both consumers and policymakers. Often estimation of that effect is difficult because data are nonexperimental and the dependent variable exhibits a high proportion of zeros. The authors propose a model of utilization that addresses both problems. After controlling for chronic illness and other observed variables, they find no evidence of further selectivity bias in equations for physician contacts and inpatient days. The authors' estimates of the effect of health-plan membership on utilization of services are similar to those from experimental data. Coauthors are Roger Feldman, Steven Cassou, and Michael Finch. Copyright 1991 by MIT Press.