Units of Measurement and the Stone Index in Demand System Estimation
论文指出线性近似理想需求系统估计中常用的斯通指数对计量单位变化不敏感，可能影响模型近似效果，建议修改斯通指数或改用常规价格指数。
Abstract The Stone index typically used in estimating linear almost ideal demand systems is not invariant to changes in units of measurement, which may seriously affect the approximation properties of the model. A modification to the Stone index, or use of a regular price index instead, are both desirable practices in estimating linear AI models.