李同學(xué)
2018-04-01 16:04reading 22中,72頁PPT,risk in LDI中,后面三段話是什么意思?“measurement error for asset BPV這開始到最后,不明白什么
所屬:CFA Level III > Alternative Investments for Portfolio Management 視頻位置 相關(guān)試題
來源: 視頻位置 相關(guān)試題
1個回答
Irene助教
2018-04-02 13:28
該回答已被題主采納
同學(xué)你好。
麻煩你截圖一下,或者明確說明一下是哪一本書嗎?我找了原版書和講義,72頁都沒有這部分的內(nèi)容。謝謝。
以下是原版書有關(guān)measurement error的全部內(nèi)容。請問你想問的是哪一部分呢?
Measurement error for Asset BPV can even arise in the classic immunization strategy for Type I cash flows, which have set amounts and dates. In practice, it is common to approximate the asset portfolio duration using the weighted average of the individual durations for the component bonds. A better approach to achieve immunization, however, uses the cash flow yield to discount the future coupon and principal payments. This error is minimized when the underlying yield curve is flat or when future cash flows are concentrated in the flattest segment of the curve.
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追問
就是您寫的這段,看不明白,謝謝
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追答
同學(xué)你好。"Measurement error for asset BPV can also arise in the classic immunization strategy for type I cash flows;"。這句話是說因為asset中我們假設(shè)其他類和權(quán)益類投資的duration都是0,但是在現(xiàn)實中,可能并不是,所以asset 端的duration測量不準(zhǔn),導(dǎo)致BPV測量不準(zhǔn)。而這種誤差和liaiblity端無關(guān),所以對于CF的時間和金額都固定的,type I cash flow也是同樣有measurement error存在。
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追答
“The measurement error for asset BPV is minimized when the underlying yield curve is flat or when future cash flows are concentrated in the flattest segment of the curve.”
因為duration測量不準(zhǔn)確,所以免疫作的不完美,所以如果利率變動,還是會導(dǎo)致asset沒有辦法很好地免疫liability的利率風(fēng)險。
只有在yield curve flat的情況下,利率幾乎不變動,免疫才能成立。
或者說如果大部分現(xiàn)金流集中出現(xiàn)在yield curve最平緩的地方,也就是說出現(xiàn)CF,需要免疫的時候,利率不變動。此時,免疫也能成立。 -
追答
“The model assumes that the change of asset yield, hedge yield and liability yields are the same, and this would increase the model risk as well.”
因為模型用BPV做免疫,BPV是假設(shè)所有利率都變動1個BPS。
但是在現(xiàn)實中,同樣1個BPS的市場利率波動,bond和equity或者alternative的yield不一定正好波動1個bps。有可能asset yield變動0.5個bps,bond變動1.2bps。所以模型中,假設(shè)三者相同是一個不現(xiàn)實的假設(shè)。而這種不現(xiàn)實的假設(shè),同樣也會增加model risk。
