TLDR: Recast’s research team made model fitting for our Bayesian MMM 5-20x faster and reduced the median runtime from hours to just minutes. We’ll explain how in this article. Runtimes limit how quickly you can deploy a model and how many iterations you can make before a strategic review. So if a model runs in 10 minutes, for instance, you can question a result, change an assumption, and rerun it before it gets put into action. Although our code is written in Stan, the ideas we used to accelerate Bayesian MMM fitting also apply to Python and R, so a lot of the discussion below will be helpful to practitioners more broadly. When Michael K and I started Recast, fitting…
One of the ever-present problems with marketing mix modeling is that you always have to choose some start date. And since you always need to choose a start date, there’s always some period before the start date that’s impacting your results. Here's how Recast handles these carry-over effects.
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