De-vigging (removing the vig/overround from bookmaker odds) converts market prices to fair implied probabilities. It is a prerequisite for any accurate EV calculation — you cannot compare a model's probability to a bookmaker's odds without first removing the margin built into those odds. SmartMatchPick's AI engine de-vigs all available market prices before computing expected value on every prediction, using the basic proportional method as default with Shin method as secondary for markets with extreme favourite-longshot bias.
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