证券交易策略的风险评估:一个风险收益模型

Risk Assessment on Securities Trading Strategy:A Risk-Benefit Model

本文以二项分布为基础,建立一个风险收益模型作为证券交易策略风险评估的理论依据。该模型从理论和实证上证明:在单次交易的收益率不变以及不考虑交易成本的条件下,交易策略的长期风险不依赖于交易次数,只取决于正收益相对负收益的幅度,而不取决于正收益在总交易次数中的比率。该模型作为风险评估工具为证券交易策略提供了理论基础,同时给出了通过计算交易策略的alpha值来估计其长期风险的预测方法。

This paper sets up a risk-benefit model based on binomial distribution in order to provide theoretical foundation for risk assessment on securities trading strategy. This model proves from both theoretical and practical views that under some conditions the long-term risks of trading strategy are not relative to the number of transactions or the ratio of the number of positive-benefit transactions over the total number of transactions, they are only rely on the extent of positive benefits over negative benefits. This model as a tool of risk assessment provides basic foundation for securities trading strategies and gives a forecasting method to estimate long-term risks by calculating the value of alpha of trading strategy.