Research of spare demand based on zero-inflated Poisson model

Aiming at some equipment being stored in most of its life cycle,a method was brought forward to find spare demand by using zero-inflated Poisson model.The model assumes the data equaling zero and the data with the Poisson distribution forming a mixed distribution.Based on the zero-inflated Poisson model,the parameters in the model were estimated and an example was given to show the method′s validity.