[] () a measurement of how much the price of a share has changed in a particular period of time, compared with the average change in the price of all shares in the market. A share with a high beta coefficient is likely to rise or fall more than the average.贝塔系数（用来衡量一定时间内，个别股票相对于整个股市的平均价格波动情形。贝塔系数高的股票比股市平均价格波动大）◆A fund with a beta coefficient of 1.0 will move exactly like the market.贝塔系数为 1 的基金与市场完全同步波动。