The single-factor model thinks, the rate of return of the stock can be explained with system risk and none system risk together, but it limits the system risk in a factor (such as market index).
单因素模型认为，股票的收益率可以由系统风险和非系统风险联合解释，但它把系统风险限制在一个因素（如市场指数）当中。
The fourth chapter introduces the 14 banks in this collection of stock price data, and based on the calculation of the stock index and the rate of return sequence.
第四章引见了本所搜集的14家银行的股票价钱数据，并基于此盘算了其股票指数及收益率序列。
According to statistical analysis on Shanghai stock index, the distribution of the rate of return is non-positive skewed, and there exists an autoregressive heteroskedasticity in the rate of return.
通过对上证指数的统计分析表明，上证指数的收益率分布表现出非正态性，并存在自回归条件异方差的特征。
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