All models are wrong, but some models are useful. If we're considering the most ...

		learnstats2 on March 8, 2020 \| parent \| context \| favorite \| on: Mathematical marketing: a piece of calculus to cha... All models are wrong, but some models are useful. If we're considering the most effective ad spend, then there's no reason that the model has to make sense for 0 ad spend.