岳同学2019-12-10 15:45:07

請問老師，如果加入了rare negative event會不會造成風險被高估? 在原版書中提到 "If our data series includes even one observation of a rare event, we may substantially overstate the likelihood of such events happening in the future. Within a finite sample, the observed frequency of this bad outcome will far exceed its true probability." 但是在視頻中 slide 12-114提到 This issue could also lead to an underestimation of risk when sample data include rare negative events.