Modeling Consumer Purchase Events: A Reply to Lawrence
回应了Lawrence在JMR上提出的用对数正态分布替代负二项模型中伽马分布的做法，指出其建模不完整且数据分析与隐含模型不一致，并论证了伽马分布相比对数正态分布的优势。
In the May 1980 issue of JMR, Lawrence replaces the gamma distribution on the purchasing rate component of the negative binomial model with the lognormal distribution. In this response the author shows that Lawrence's modeling effort is incomplete and that his data analysis is inconsistent with his implied model. In addition it is argued that the gamma distribution per se has some major advantages with respect to the lognormal distribution proposed by Lawrence.