股票市场收益序列存在某种长程相依性,利用分数布朗运动来研究这一问题已经取得了一定的成果。本研究将拓展这一类模型,在模型中综合考虑时滞以描述股票市场中的短期趋势效应。在对分数布朗运动的Hurst指数做出一定限制的条件之下,证明这类市场模型是有意义的,也即可以被用于刻画股票价格的变化,进而可以被用于欧式期权定价。
Stock market returns presents a quality of long memory' property. Scholars have come to some good results from studying fractional Brownian motion. The kind of models is extended, and stock market is illustrated by delay stochastic differential equation. The established model is proven to be meaningful, and can be used in European option pricing under some constraint on Hurst index.