So how do we go about measuring these things and what sorts of errors are in them, and how accurate are they?

那么我们该如何去评估,其中产生怎样的误差,它们又准确到什么程度

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Now you can begin to see the kinds of errors that this method might produce because people forget, they can't remember exactly how much they ate of things, or they may not be willing to disclose everything they ate.

现在你就可以明白各种误差,是由人们的遗忘而产生的,他们无法准确记得吃了多少东西,他们不会透露所有自己吃的东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选