There is much debate about whether the Medicare Prescription Drug Bill -- the greatest expansion of Medicare benefits since its creation in 1965 -- will improve the health of elderly Americans, and how much it will cost. We model how insurance affects medical care utilization, and subsequently,...

This paper addresses estimation of an outcome characterized by mass at zero, significant skewness, and heteroscedasticity. Unlike other approaches suggested recently that require retransformations or arbitrary assumptions about error distributions, our estimation strategy uses sequences of...

There is much debate about whether the Medicare Prescription Drug Bill -- the greatest expansion of Medicare benefits since its creation in 1965 -- will improve the health of elderly Americans, and how much it will cost. We model how insurance affects medical care utilization, and subsequently,...

This paper addresses estimation of an outcome characterized by mass at zero, significant skewness, and heteroscedasticity. Unlike other approaches suggested recently that require retransformations or arbitrary assumptions about error distributions, our estimation strategy uses sequences of...