An Econometric Model of the Two-Part Decisionmaking Process in the Demand for Health Care
提出一个负二项分布障碍模型，将就医决策分为是否就医和就医频率两个独立阶段，并用西德社会经济面板数据验证，发现忽略这种区分会导致严重误读。
The decision to contact a physician and the decision about how often to contact a physician are determined by different decisionmakers. We introduce a negative binomial distributed hurdle model that specifies the two stages of the decisionmaking process as different stochastic processes, while at the same time taking care of the discrete nature of the data. Empirical results are based on a cross-section of the West German Socioeconomic Panel. Specification tests reveal that the two stages of the process need to be treated as two distinct processes. This, in turn, implies that ignoring this distinction leads to serious misinterpretation.