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keisanHigh-precision calculations for everyday life and work

Gamma-Poisson-Leisen-Shi Model

Author: tonagaiExecutions: 990

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This calculator computes the Gamma-Poisson Recency Model, which predicts “When was the last purchase?” and “When was the last visit?”
Calculations can be performed up to 10 periods back; please enter “0” for any periods you do not need (do not leave them blank).
To calculate the parameters m and k, please use a separate formula I created, accessible via the link below.
Reference: “Strategic Thinking Through Probability: The Power of Mathematical Marketing, Proven at USJ” (Tsuyoshi Morioka, Seiki Imanishi)
Average number of purchases per month, m
NBD model parameter k
Period 1 (Present–)
month(s)
2 periods ago (starting from 1 period ago)
month(s)
3 periods ago (starting from 2 periods ago)
month(s)
4 periods ago (starting from 3 periods ago)
month(s)
5 periods ago (from 4 periods ago)
month(s)
6 periods ago (from 5 periods ago)
month(s)
7 periods ago (from 6 periods ago)
month(s)
8 periods ago (7 periods ago–)
month(s)
9 periods ago (from 8 periods ago)
month(s)
10 periods ago (from 9 periods ago)
month(s)

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