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For on-topic questions about statistics or machine learning used in marketing or market research.

1 vote

Stats Metric for how dynamic/changing a market is

If you compare two consecutive months, you have two rankings of the car brands. Thus, you can calculate the Kendall tau distance betwen the rankings (if you want the distance to be in the unit interva …
Stephan Kolassa's user avatar
1 vote

Marketing Promotion modelling, effects of a competitor's promotions

It's a reasonable approach in my opinion. A couple of things to keep in mind: If there is always a promotion running, then you won't be able to get a good "baseline" estimate, so it will be hard-to-i …
Stephan Kolassa's user avatar
9 votes
Accepted

Poisson Gamma Mixture = Negative Binomially Distributed?

There are various ways a negative binomial distribution can come about. One of them, as Robert Long comments, is as a Poisson distribution whose parameter is itself Gamma distributed. The Wikipedia pa …
Stephan Kolassa's user avatar