The bundling sale of information products has been a prevalent strategy in information industries. This paper attempts to study two issues that have not been adequately addressed in previous researches. First, we define the measure of customer heterogeneity by considering both the statistic...

Fuzzy time series has been applied to forecast various domain problems because of its capability to deal with vagueness and incompleteness inherent in data. However, most existing fuzzy time series models cannot cope with multi-attribute time series and remain too subjective in the partition of...