這道題中說the probability of observing such a large alpha by chance is only 1%,是不是理解成投資者認(rèn)為極大的超額收益偶然出現(xiàn)的概率只有1%?如果是這樣,原假設(shè)是不是應(yīng)該是alpha≠0?
這個例題中0.076表示的意思是repo 的收益率了吧,為什么0.077=101.9/100×0.076
A portfolio manager produced an alpha of 2.5% based on monthly returns over a 6 year period. Under the assumption of a normal distribution, the portfolio manager claims that the probability of observing such a large alpha by chance is only 1%. To test her claim, one would use a t-test using which level of confidence? 老師您好!我想問一下,就是這道題里他說觀測到很大的α,是指單尾的1%還是雙尾的1%。我認(rèn)為是單尾的,所以在進(jìn)行假設(shè)檢驗(yàn)找臨界值的時候,應(yīng)該找98%的兩個臨界值。這樣兩邊各留出1%,才能判斷原假設(shè):“α=0”是否是正確的。
327題 請問這題的contemporaneous beta和 lagged beta 怎么理解 它們和高收益低風(fēng)險的關(guān)系怎么理解?
John, a portfolio manager, claims to have consistently produced excessive returns (over and above the benchmark returns) 97.5% of the time due to her skill and not luck. To support her claim, she presents regression results based on 60 monthly observations as follows: alpha = 0.43%, standard error of alpha = 0.21% Would you reject the null hypothesis of true α = 0 and accept her claim of superior... 老師您好!我想問一下,這道題到底置信區(qū)間是多少?他說97.5%的概率下,他的優(yōu)異表現(xiàn)是源自于能力不是運(yùn)氣。我的理解是,他的表現(xiàn)好,那么應(yīng)該是單尾的97.5%,而右側(cè)的尾巴是2.5%,而不看虧損的一側(cè)。做假設(shè)檢驗(yàn)時,95%的置信區(qū)間恰好表示了左右兩邊各2.5%的情況,因此,置信區(qū)間應(yīng)該是-1.96到1.96。
老師 請問第2題為何選A?謝謝
229題目,選項(xiàng)c 0.33t bond 哪兒來的
Which of the following statements is incorrect concerning the low-risk anomaly? A The low-risk anomaly conflicts with the CAPM. B The firms with higher beta perform indifferently with the lower beta firms. C The low-risk anomaly point to a negative relationship between risk and reward. D The low-risk anomaly suggests that low-beta stocks will outperform high-beta stocks. 老師您好!我想問一下,視頻中說關(guān)于β的結(jié)論是ρ(βt-1, rt)是noisy的,而ρ(βt, rt)>0,而這道題的講解中,老師說low-risk anomaly中β和收益率是反向關(guān)系,哪一個是正確的?
325
324。題目
317題
58題 利率模型里的波動率 用年化的波動率 間隔是1個月 這個波動率還用調(diào)整到月嗎?前面的練習(xí)題都不用調(diào)整 這題不調(diào)整的話算出來不對 后面答案計(jì)算錯誤 我想知道這個波動率是就是用年化的嗎 就通過后面dw調(diào)整?
請問老師,這里為什么相關(guān)系統(tǒng)有10個呢,這個10是從何而來呢
如果將205頁這個題目中I和II說法的regulatory capital和Economic capital位置互換,這兩個說法還是否正確?
請問老師,這個圖里的LR是指的什么呀
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