An Investigation of the Assumptions of the NBD Model as Applied to Purchasing at Individual Stores
实证检验NBD模型在个体商店购买中的假设，发现泊松假设对多数消费者成立，模型对中心商店拟合良好，对郊区商店需调整样本。
This paper presents an empirical investigation of the assumptions of the NBD model in the context of purchasing at individual stores. A formal testing procedure against the assumption that individuals' inter‐purchase times follow an exponential distribution shows that the Poisson assumption of the NBD model holds for the majority of consumers. The theoretical negative binomial also fits closely for centrally located stores. For suburban stores the relevant population hypothesis is of some importance, and refitting the model to a local subset of the sample removes certain small but consistent discrepancies. The NBD model may thus play an important role in studies of urban consumer behaviour.