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This post will probably be old news to seasoned modellers, but it’s worth repeating even for those of us who have been burned before when creating such models. For the love of all that is good in this world, get your data sources perfected before embarking on a prescriptive model. There are four types of model: 1) Descriptive: what happened? 2) Diagnostic: why did it happen? 3) Predictive: what is going to happen? 4) Prescriptive: what should we do? They are in that order for a reason. If your c...