The demand for a healthy diet: estimating the almost ideal demand system with infrequency of purchase
引入贝叶斯方法估计多元样本选择模型，用于处理因购买频率低导致的截断问题，并应用于英国食品需求系统，发现低收入和社会经济状况差会导致不良饮食，而家中有孩子会降低饮食质量。
A Bayesian method of estimating multivariate sample selection models is introduced and applied to the estimation of a demand system for food in the UK to account for censoring arising from infrequency of purchase. We show how it is possible to impose identifying restrictions on the sample selection equations and that, unlike a maximum likelihood framework, the imposition of adding up at both latent and observed levels is straightforward. Our results emphasise the role played by low incomes and socio-economic circumstances in leading to poor diets and also indicate that the presence of children in a household has a negative impact on dietary quality.