這里為啥要把題目中的收益當(dāng)做μ使用,而不是用R反算μ呢?或者直接用lognormal VAR 計(jì)算 ,VAR=(1-e的r次方)*Pt-1
還是不太理解,為什么model1在長期會(huì)呈下降趨勢,model1和凸性效應(yīng)到底有什么關(guān)系?課程里沒講啊
請(qǐng)幫忙看下右側(cè)問題
老師說如果題目說的是5%VAR,那其實(shí)就是95%VAR。如果是這樣子的話,那么這道題算出來VAR是-3.5,那是不是應(yīng)該說95%的收入沒有超過3.5,而5%的收入超過了3.5.
sigema和dw完整的名字分別叫做什么?
1、copulas假設(shè)產(chǎn)品之間是正相關(guān)還是負(fù)相關(guān)呀? 2、相關(guān)性上升是什么意思,從0到-1算是上升還是下降呢?
A portfolio manager owns a portfolio of options on a non-dividend paying stock RTX. The portfolio is made up of 10,000 deep in-the-money call options on RTX and 50,000 deep out-of-the money call options on RTX. The portfolio also contains 20,000 forward contracts on RTX. RTX is trading at USD 100. If the volatility of RTX is 30% per year, which of the following amounts would be closest to the 1-day VaR of the portfolio at the 95 percent confidence level, assuming 252 trading days in a year?標(biāo)的資產(chǎn)的VaR值如何計(jì)算?
所以什么情況下是sensitive,什么情況下是insensitive呢?D答案中是永遠(yuǎn)沒有機(jī)會(huì)行權(quán)的,說成是insensitive不也是對(duì)的么?只有敲出價(jià)和行權(quán)價(jià)相等才能叫insensitive么?
老師 請(qǐng)問一下為什么隱含波動(dòng)率越高價(jià)格越高呀
老師 請(qǐng)問如果這道題改成不獨(dú)立是否應(yīng)該選0
為啥要乘以1/12;不是乘以(-0.5)平方嗎?題目給出根號(hào)dt=-0.5
model1是什么?這個(gè)知識(shí)點(diǎn)以前學(xué)過么?
Let X be a random variable representing the daily loss of your portfolio. The “peaks over threshold” (POT) approach considers a threshold value, u, of X and the distribution of excess losses over this threshold. Which of the following statements about this application of extreme value theory is correct? B If X is normally distributed, the distribution of excess losses requires the estimation of only one parameter, β, which is a positive scale parameter.這個(gè)選項(xiàng)為什么是錯(cuò)的,normally distributed不就代表tail index=0嗎?那這么看來就只需要規(guī)模參數(shù)這一個(gè)參數(shù)即可
這個(gè)10 day的var怎么體現(xiàn)呢?計(jì)算的時(shí)候沒有考慮啊……按照解析的方式,10 day的VAR與1 day的VAR沒有區(qū)別啊……不用考慮平方根法則把它變?yōu)橐惶斓腣AR再去計(jì)算么?
老師 請(qǐng)問一下 為什么要乘100呀 不知道這道題該套什么公式 麻煩老師講解一下
程寶問答