金程問(wèn)答http://www.h8045.cn/squareques/id_784273.html 答復(fù)說(shuō)我的紅色推倒部分粗心了,您再看一下
Module 4-官網(wǎng)習(xí)題-第51題-(1)為什么要standardize a normal random variable?什么情況下,需要標(biāo)準(zhǔn)化一個(gè)正態(tài)隨機(jī)變量?(2)另外,答案中所寫(xiě)的:Thus, ($480,000 ? $355,000)/3.0 = $41,667.Alternatively, use Z = ?3, X = $230,000, and μ = $355,000: ($230,000 ? $355,000)/(?3.0) = $41,667.為什么480,000用z=3,而-480,000用z=-3?(3)另外,為什么,在正態(tài)分布下, mean=(maximum+minimum)/2?這個(gè)公式在教材第幾頁(yè)上有寫(xiě)?
Module 4-官網(wǎng)習(xí)題-第52題-答案中所寫(xiě)的:The portfolio with the highest safety-first ratio minimizes the probability that the investor’s portfolio will have a value lower than $700,000 at year end.但是教材P264所寫(xiě)的是,Roy’s safety-first criterion (Roy 1952) states that the optimal portfolio minimizes the probability that portfolio return, RP, will fall below the threshold level, RL. 這道題中的$700,000是threshold level RL? 另外,教材P264-Example 7上方最后一段的最后一句話,所寫(xiě)的:When we evaluate portfolios using the Sharpe ratio, the portfolio with the highest Sharpe ratio is the one that minimizes the probability that portfolio return will be less than the risk-free rate (given a normality assumption).這道題中的$700,000是the risk free rate(given a normality assumption)? 請(qǐng)問(wèn)最優(yōu)的Roy's Safety-First Ratio 將使什么的概率(低于什么的值)最小化?
Module 5-教材P325當(dāng)中部分,請(qǐng)問(wèn) z0.05 = 1.65 以及 z0.025 = 1.96 是怎么得出的?
教材P318-Module 5-Example 6-倒數(shù)第4行:the population variance of capital expenditures is equal to (100 ? 0)2/12 = 833.33 (i.e., σ2= (b ? a)2/12),但是依照教材P125-公式(10),公式(10)和這道題里的公式σ2= (b ? a)2/12,是不一致的?這道題里的公式σ2= (b ? a)2/12,在教材第幾頁(yè)有寫(xiě)?另外,教材P319倒數(shù)第二段所陳述的,The overall average of the sample means is $49.92, with a standard error equal to $2.80. 請(qǐng)問(wèn)49.92和2.80這兩個(gè)數(shù)是怎么得出的?
問(wèn)下哦,SD除于mean,為什么單位m可以約掉?又不是SD乘以m再除于(mean乘以m)才可以約掉m。
Module 1-官網(wǎng)習(xí)題-第42題-(1)30-year ARM求解K的步驟,不太能夠理解,為什么前3年和后27年,用的N都是12*27=324?(2)另外,請(qǐng)分別解釋一下,步驟1中的First, the balance at end of Year 3 is found: N = 12 × 27 = 324, I/Y = (3.75/12) = 0.31250, FV = 0, PMT = 463.12, calculate PV = 94,271.43.----代表什么含義?步驟2中的Then, K is calculated as follows: N = 324, I/Y = (5.5/12) = 0.45833, PV = 94,271.43, FV = 0, calculate PMT = 559.16.----代表什么含義?這兩個(gè)步驟,我都不是很能理解,請(qǐng)解析
Module 1-官網(wǎng)習(xí)題-第35題-以本題為例,請(qǐng)問(wèn)教材P11的公式(3)和教材P12的公式(4)的區(qū)別是?為什么這道題用公式3,而不是公式4?
為什么這個(gè)章節(jié)練習(xí)題中第4道小題,可以拿T-STATIC中的SHIFT 的8.多去和CV對(duì)比,SHIFT不是斜率嗎
Sample的normal distribution為什么是等于3?是假設(shè)嗎?
在tree map中,value difference怎么理解?
這道題為什么不用算數(shù)平均數(shù)計(jì)算?
Module 5 教材原文答疑,請(qǐng)見(jiàn)截圖
Module 1-官網(wǎng)習(xí)題-39題-(1)為什么這道題,要用教材P12的公式(4),而不能用教材P7的公式(2)? 公式4和公式2的區(qū)別是?(2)另外,怎么判斷這是否是一個(gè)given lump sum?
為什么不考慮大于-1.71%的情況?
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