b******4 发帖数: 70 | 1 在single index model中 CAPM 是有缺陷的,可以用什么办法improve这个CAPM模型呢
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p******g 发帖数: 321 | 2 说仔细一点
【在 b******4 的大作中提到】 : 在single index model中 CAPM 是有缺陷的,可以用什么办法improve这个CAPM模型呢 : ?
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b******4 发帖数: 70 | 3 单一指数模型的回归只受beta影响吧
Beta是敏感于市场代理和什么期间获得的数据
那么单指数模型在CAPM模型中不就是有其局限性
什么样的解决方案你能想到的,使这样的资产定价模型更可靠?
【在 p******g 的大作中提到】 : 说仔细一点
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p******g 发帖数: 321 | 4 除非你加指数,没法解决
不过即使加指数,你说的局限性还是存在
【在 b******4 的大作中提到】 : 单一指数模型的回归只受beta影响吧 : Beta是敏感于市场代理和什么期间获得的数据 : 那么单指数模型在CAPM模型中不就是有其局限性 : 什么样的解决方案你能想到的,使这样的资产定价模型更可靠?
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b******4 发帖数: 70 | 5 如果用adjusted beta, predicting beta 能否改善?
【在 p******g 的大作中提到】 : 除非你加指数,没法解决 : 不过即使加指数,你说的局限性还是存在
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p******g 发帖数: 321 | 6 "adjusted beta" just another way to add an additional variable.
Mathematically, it may fit better to historical data. But what you really
want is the beta for the future.
Same thing with predicted beta. It is still based on your assumption of the
realtionship with historical data and the "chosed" historical data. Can your
assumption hold and how do you justify the historial data you pick as a
base for predicting?
【在 b******4 的大作中提到】 : 如果用adjusted beta, predicting beta 能否改善?
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b******4 发帖数: 70 | 7 Thanks.那么要是CAPM更reliable需要从哪方面入手呢
the
your
【在 p******g 的大作中提到】 : "adjusted beta" just another way to add an additional variable. : Mathematically, it may fit better to historical data. But what you really : want is the beta for the future. : Same thing with predicted beta. It is still based on your assumption of the : realtionship with historical data and the "chosed" historical data. Can your : assumption hold and how do you justify the historial data you pick as a : base for predicting?
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s***r 发帖数: 1121 | 8 you are wasting your time and your efforts. |
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p******g 发帖数: 321 | 9 It is an art, not science |
c********n 发帖数: 112 | 10 conditional beta (ICAPM), ff three factor model, momentum factor,etc. |
l**********t 发帖数: 5754 | 11 there are many papers on factor models. you can search for French/Fama 3-
factor model for starters |