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Dealing with the common econometric problems of count data with excess zeros, endogenous treatment effects, and attrition bias

, , and . Economics Letters, 62 (1): 7--12 (Jan 1, 1999)

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Medicaid reform. AEI studies in health policy American Enterprise Inst. for Public Policy Research, Washington, DC u.a., (1984)Dealing with the common econometric problems of count data with excess zeros, endogenous treatment effects, and attrition bias, , and . Economics Letters, 62 (1): 7--12 (Jan 1, 1999)