Any change in rate levels indicated by raw datais usually tempered by a credibility factor, which reflectsthe degree of confidence the ratemakers believethey should attach to past losses as predictorsof future losses. The credibility assigned to a particularbody of loss experience is determined primarilyby the number of occurrences, following thestatistical principle that the greater the sample size,the more closely will observed results approximatethe underlying probability. To obtain a sufficientlylarge number of observed losses for achieving anacceptable level of credibility, the ratemaker mustsometimes include loss experience over a period ofseveral years. The less frequent the losses in a particularline of insurance, the longer the period neededto accumulate loss statistics necessary to achieve agiven level of credibility
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