1993年巴菲特致股东信原文

Academics, however, like to define investment "risk" differently, averring that it is the relative volatility of a stock or portfolio of stocks - that is, their volatility as compared to that of a large universe of stocks. Employing data bases and
statistical skills, these academics compute with precision the "beta" of a stock - its relative volatility in the past - and then build arcane investment and capital-allocation theories around this calculation. In their hunger for a single statistic to measure risk, however, they forget a fundamental principle: It is better
to be approximately right than precisely wrong.

然而学术界喜欢用另一种方式定义“风险”，他们主张，风险就是一个股票（或一组投资组合）在过去的相对波动。用数据和统计学方法，他们针对每个股票计算出来一个准确的“贝塔系数”，并基于这个计算，建立起晦涩复杂的投资和资产配置的理论。尽管他们亟愿用一个简单的统计学系数来测量风险，他们遗忘了一个基础的原则：模糊的正确比精确的错误要好。