To report what already happened in the form of a prediction.
I postdict that Obama won the 2008 presidential election.
Brian Miller writes: Postdiction is an explanation after the event: the lamest and laziest form of prophecy.
In skepticism, it is considered an effect of hindsight-bias that (only afterwards) explains claimed predictions of significant events.
Happens often at race-tracks and masked wine tastings.
Larry Lockshin adds: "I knew it." Used extensively in business case studies, which often purport to cause and effect: they did this, and that happened.
It is not a predictor of outcomes for those following the claims.
A typical postdiction might be:
It was after I switched from Corn Flakes to Rice Krispies that women started to notice me. You should try Rice Krispies. They could work for you too...
Obvious in hindsight; predictable after the fact.
It seemed like a good idea at the time but its failure was entirely postdictable.
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To only find something out so far behind it took place that it is almost impossible to not have been aware of it before.
Friend: Oh my God I just started listening to Michael Jackson and it turns out he's dead! I swear this always happens.
Friend 2: Bro, you postdicted that.