U.S. Food Expenditures Away from Home by Type of Meal
使用非正态异方差双障碍模型研究美国家庭在早餐、午餐和晚餐外出就餐的支出，发现妻子就业对午餐和晚餐支出有正向影响，收入效应显著为正，家庭构成和地区也重要。
A nonnormal and heteroskedastic double-hurdle model is used to study household expenditure on breakfast, lunch and dinner away from home in the United States. In the 1992-93 period, nearly 40 percent of households purchased breakfast, and about 75 percent of households purchased lunch or dinner in a two-week period. Wife's employment has a positive effect on the probability and level of lunch and dinner expenditures but not on breakfast expenditures. Income effects are al statistically significant and positive. The role of household composition, other demographics and region are also important.