The frequency of error is always higher than the estimated error rate as only quantifiable errors are included in the error rate calculation, and many have only a low financial impact.
Vigade esinemissagedus on alati suurem kui hinnanguline veamäär, kuna selle arvutamisel võetakse arvesse ainult kvantifitseeritavaid vigu ning paljud neist avaldavad vaid väikest finantsmõju.