Originally Posted by
Dark Horse
It's a few percentage point for exit polls, but the same idea could be tightened up.
Theoretically, one could make a case that there are no complete populations, because these would also have to include the future. As such, again theoretically, an advanced random distribution approach may even produce more reliable results (going forward) than the past, because it would filter out extremes that throw off the model.
In any case, some systems are extremely time-consuming to backtest against an entire population, so there would be value in a scientific shortcut. The Z-score gives enough of a measure of reliability, so my question here is about statistical distribution.