阿同學(xué)
2020-10-09 17:29關(guān)于active risk和active share 這幾句話不是很懂,請(qǐng)老師幫忙解釋下
所屬:CFA Level III > Equity Portfolio Management 視頻位置 相關(guān)試題
來(lái)源: 視頻位置 相關(guān)試題
1個(gè)回答
Kevin助教
2020-10-10 10:53
該回答已被題主采納
同學(xué)你好!
目前原版書上的原話是這樣的,和圖中略有差別。
■if the factor exposure is fully neutralized, the active risk will be entirely attributed to Active Share;
■the active risk attributed to Active Share will be smaller if the number of securities is large and/or average idiosyncratic risk is small; and
■the level of active risk will rise with an increase in factor and idiosyncratic volatility (such as occurred in 2008)
1.由于是single-factor model,對(duì)沖因子敞口后,如果還有active return,那么一定是active share引起的,因此active risk(即active return的波動(dòng))完全是由active share引起的。
2.講的是diversification的好處,Active Share引起的active risk會(huì)由于分散的好處變小;平均非系統(tǒng)風(fēng)險(xiǎn)小的時(shí)候也是類似的。
3.因子波動(dòng)率和非系統(tǒng)風(fēng)險(xiǎn)波動(dòng)率升高時(shí),active risk也會(huì)升高,參考2008的金融危機(jī)就比較容易理解了。
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