michaeld writes "The "Bayesian" techniques for spam filtering recently publicized in Paul Graham's essay A Plan for Spam doesn't actually seem to have anything Bayesian about it, according to Gary Robinson (an expert on collaborative filtering). It is based on a non-Bayesian probabilistic approach. It works well enough, because it is frequently the case that technology doesn't have to be 100% perfect in order to do something that really needs to be done. The problem interested Robinson, and he posted his thoughts about trying to fix the problems in the Graham approach, including adding an actual Bayesian element to the calculations."
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