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【多选题】
下列关于β系数的说法中正确的有( )。A.
β系数度量了股票相对于平均股票的波动程度
B.
β=2,说明股票的风险程度也将为平均组合的2倍
C.
β=0.5,说明股票的波动性仅为市场波动水平的一半
D.
证券组合的β系数是单个证券β系数的加权平均，权数为各种股票在证券组合中所占的比重
E.
β系数一般不需投资者自己计算，而由一些投资服务机构定期计算并公布
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