Note—Derivation of Covariance Probit Elasticities
推导了完整协方差Probit模型中N个品牌情形的交叉品牌效应和直接弹性的显式公式，填补了文献空白。
The full covariance probit model is highly regarded due to the flexibility with which it can represent cross brand effects. Explicit formulae for these cross brand effects for the general N brand case have never appeared in print, nor have the direct elasticities for the model. This note fills that omission.