Heterogeneity in Models of Purchase Frequency : a Comparison of Poisson-Gamma Mixtures with Finite Poisson Mixtures
Poisson models are fundamental in the modelling of purchase frequencies. However, very often they are statistically incompatible with the data. This stems from the fact that the mean is assumed to be equal to the variance and, in consequence, this fails to capture heterogeneity. Thus Poisson mixture...
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| Format: | Article |
| Language: | English |
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Wrocław University of Science and Technology
2010-01-01
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| Series: | Operations Research and Decisions |
| Online Access: | http://orduser.pwr.wroc.pl/DownloadFile.aspx?aid=168 |