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CFA问答
CFA问答包含CFA在线课程、CFA通关课程、CFA试题等所有CFA相关问题,每个问题老师均会在24小时内给出答疑回复哦!
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01.单选题 已收藏 标记 纠错 Regarding an equally-weighted portfolio made up of a large number of assets, choose one of the following contributes the most to the volatility of the portfolio: A Standard deviation of the individual assets. B Average covariance between all pairs of assets. C Average variance of the individual assets. 查看解析 下一题 正确答案B 您的答案B本题平均正确率:65% Return measures, properties of returns难度:一般 推荐: 答案解析 The co-movement measures between the assets increases (i.e., covariance and correlation) as the number of assets in the equally weighted portfolio increases. The contribution of each individual asset's variance (or standard deviation) to the portfolio's volatility decreases as the number of assets in the equally weighted portfolio increases. The following equation for the variance of an equally weighted portfolio illustrates these points: 请问:这个公式要不要掌握,有计算吗?
关于这里的a/2,老师在讲ppt时说 如果是单尾的话是直接查的a/2,那双尾的话就查的是a 吗?。比如说95%置信区间上的,如果是单尾的话就查5%/2 ,而双尾的就查5%吗? 这页ppt内关于上述这一点的几分钟讲解,不是很明白讲解老师讲的含义,求详细解释!
ppt讲解中,老师先说到假设是95%单尾检验(见图上半部分),如果观测量大于1.65或者小于-1.65,则拒绝原假设。 但在下一张ppt中(见图下半部分右下角),若观测量大于1.65的,拒绝原假设,小于1.65的则都判定为无法拒绝原假设。 故想问:若观测量算出来小于-1.65,到底是判断为接受原假设 ,还是无法拒绝原假设?
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