期望值法是通过计算项目净现值的期望值和净现值大于或等于零时的累计概率，来比较方案优劣、确定项目可行性和风险程度的方法。
期望值法（Expectancy Method ）：期望值法是为了减 少决策结果的不可靠性采用的一种方法，即决策者对一个 方案可能出现的正反两种结果，分别估计其得失数值，...
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净现值的计算有着广泛应用，现有方法中现金流量的计算大部分采用静态方法或期望值法。
NPV have been widely applied. A majority of the existing calculating methods of cash flow are the static method or the expectation method.
四个通常的产生统计以比较方案的用于投资决策方法是：现值法、年值法、期望值法和回报率法。
Four commonly used investment decision methods that generate statistics to compare projects are present worth, annual worth, future worth, and rate of return.
该方法既克服了期望值-差法和夏普指数法的不足，又在一定程度上避免了效用函数构造的困难。
The new method has overcomed the shortcomings of the Expectation-Variance method and Sharpe's Index method, and avoids the inconvenience of constructing utility function to a certain extent as well.
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