With the theory of stochastic differential equation, the authors discuss a problem of a class of risk investment portfolio with stochastic character.

利用随机微分方程理论，对一类具有随机特征的风险投资组合问题进行深入研究。

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They have a formula that defines how much Tier I and Tier II capital a bank has to hold and the amount depends on the risk class of their investments.

有一个公式可以计算出,一个银行到底需要持有多少一级和二级资本,其数量取决于他们投资项目的风险等级

耶鲁公开课 - 金融市场课程节选

The American system of trial and error produces doers: Black Swan-hunting, dream-chasing entrepreneurs, with a tolerance for a certain class of risk-taking and for making plenty of small errors on the road to success or knowledge.

FORBES

My firm uses models for approximation of asset class risk and return.

FORBES: Don't Let Models Doom Your Portfolio

Another set of potential winners: a class of diabetes medicines that may also eliminate the risk of heart attacks, known as PPAR drugs.

FORBES: Magazine Article