短語詞組短語Minimum Variance Hedge Ratio 避險(xiǎn)比率;最小方差對(duì)沖率variance -ratio distribution 方差比分布variance of ratio 比率的方差variance mean ratio method 方差比率法variance contribution ratio 方差貢獻(xiàn)率variance e ratio 方差比variance of ratio estimate 比率估計(jì)值的方差 返回 variance ratio