Sample Size Requirements for Zero-Order Models
报告了零阶模型中最大似然估计所需样本量，发现原始参数需约2000人每人5次购买，但转化为市场份额和极化指数后仅需约400人每人5次购买。
The authors report the sample sizes required to obtain maximum likelihood estimates of parameters in a zero-order model. In the typical formulation of the model, parameter estimation requires about 2000 individuals with five purchases per consumer. The original parameters can be easily transformed, however, into a market share estimate and a polarization index that convey the key information sought from the model. Estimation of the transformed parameters requires smaller samples of about 400 individuals with five purchases per consumer.