This paper discusses the estimation of the expected rate of return of stock price process.
本文讨论了股票价格过程期望收益率的估计问题。
In the option pricing with martingale way, the most important aspect is finding the equivalent martingale measure to make the discounted stock price process become martingale.
在期权定价的鞅方法中最重要是找到等价鞅测度，使得贴现的股票价格过程是鞅。
Applying the Voter model and the theory of stopping time, we construct the return process of a stock in a stock market. From this return process, we can derive the corresponding stock price process.
本文就是应用随机过程理论来建立选举模型，再应用选举模型和停时理论建立了股票收益过程，进而得到了股票价格过程。
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