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NO.PZ2021061603000025 问题如下 Annureturns ansummary statistifor three fun are listein the following exhibit:The funwith the highest absolute spersion is: A.FunPQR if the measure of spersion is the range B.FunXYZ if the measure of spersion is the varian C.FunAif the measure of spersion is the meabsolute viation C is correct. The meabsolute viation (MA of FunABC's returns is greater ththe Mof both of the other fun.MA∑i=1n∣Xi−Xˉ∣nM= \frac{{\sum\limits_{i = 1}^n {\left| {{X_i} - \bX} \right|} }}{n}MAni=1∑n∣Xi−Xˉ∣, where Xˉ{\bX}Xˉ is the arithmetic meof the series.Mfor FunA=∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣5=14.4%\frac{{\left| { - 20 - ( - 4)} \right| + \left| {23 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right| + \left| {5 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right|}}{5} = 14.4\% 5∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣=14.4% Mfor FunXYZ=∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣5=9.8%\frac{{\left| { - 33 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 8 - ( - 10.8)} \right| + \left| {11 - ( - 10.8)} \right|}}{5} = 9.8\%5∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣=9.8% Mfor FunPQR=∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣5=8.8%\frac{{\left| { - 14 - ( - 5)} \right| + \left| { - 18 - ( - 5)} \right| + \left| {6 - ( - 5)} \right| + \left| { - 2 - ( - 5)} \right| + \left| {3 - ( - 5)} \right|}}{5} =8.8\% 5∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣=8.8% A anB are incorrebecause the range anvarianof the three fun are follows: The numbers shown for varianare unrstooto in \"percent square" terms so thwhen taking the square root, the result is stanrviation in percentage terms. Alternatively, expressing stanrviation anvarianin cimform, one cavoithe issue of units. In cimform, the variances for FunABFunXYZ, anFunPQR are 0.0317, 0.0243, an0.0110, respectively. 我可以这样理解?只有meabsolute viation 才能计算absolute viationrange 及varian都不能计算absolute viation/ 与absolute viation无关所以 B 错, C 对

2024-11-16 13:47 1 · 回答

NO.PZ2021061603000025 问题如下 Annureturns ansummary statistifor three fun are listein the following exhibit:The funwith the highest absolute spersion is: A.FunPQR if the measure of spersion is the range B.FunXYZ if the measure of spersion is the varian C.FunAif the measure of spersion is the meabsolute viation C is correct. The meabsolute viation (MA of FunABC's returns is greater ththe Mof both of the other fun.MA∑i=1n∣Xi−Xˉ∣nM= \frac{{\sum\limits_{i = 1}^n {\left| {{X_i} - \bX} \right|} }}{n}MAni=1∑n∣Xi−Xˉ∣, where Xˉ{\bX}Xˉ is the arithmetic meof the series.Mfor FunA=∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣5=14.4%\frac{{\left| { - 20 - ( - 4)} \right| + \left| {23 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right| + \left| {5 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right|}}{5} = 14.4\% 5∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣=14.4% Mfor FunXYZ=∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣5=9.8%\frac{{\left| { - 33 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 8 - ( - 10.8)} \right| + \left| {11 - ( - 10.8)} \right|}}{5} = 9.8\%5∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣=9.8% Mfor FunPQR=∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣5=8.8%\frac{{\left| { - 14 - ( - 5)} \right| + \left| { - 18 - ( - 5)} \right| + \left| {6 - ( - 5)} \right| + \left| { - 2 - ( - 5)} \right| + \left| {3 - ( - 5)} \right|}}{5} =8.8\% 5∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣=8.8% A anB are incorrebecause the range anvarianof the three fun are follows: The numbers shown for varianare unrstooto in \"percent square" terms so thwhen taking the square root, the result is stanrviation in percentage terms. Alternatively, expressing stanrviation anvarianin cimform, one cavoithe issue of units. In cimform, the variances for FunABFunXYZ, anFunPQR are 0.0317, 0.0243, an0.0110, respectively. 知道了range varian还有ma但我不知道怎么比较得出的？的意思能不能翻译下，谢谢老师。

2023-05-22 22:38 1 · 回答

NO.PZ2021061603000025 问题如下 Annureturns ansummary statistifor three fun are listein the following exhibit:The funwith the highest absolute spersion is: A.FunPQR if the measure of spersion is the range B.FunXYZ if the measure of spersion is the varian C.FunAif the measure of spersion is the meabsolute viation C is correct. The meabsolute viation (MA of FunABC's returns is greater ththe Mof both of the other fun.MA∑i=1n∣Xi−Xˉ∣nM= \frac{{\sum\limits_{i = 1}^n {\left| {{X_i} - \bX} \right|} }}{n}MAni=1∑n∣Xi−Xˉ∣, where Xˉ{\bX}Xˉ is the arithmetic meof the series.Mfor FunA=∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣5=14.4%\frac{{\left| { - 20 - ( - 4)} \right| + \left| {23 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right| + \left| {5 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right|}}{5} = 14.4\% 5∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣=14.4% Mfor FunXYZ=∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣5=9.8%\frac{{\left| { - 33 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 8 - ( - 10.8)} \right| + \left| {11 - ( - 10.8)} \right|}}{5} = 9.8\%5∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣=9.8% Mfor FunPQR=∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣5=8.8%\frac{{\left| { - 14 - ( - 5)} \right| + \left| { - 18 - ( - 5)} \right| + \left| {6 - ( - 5)} \right| + \left| { - 2 - ( - 5)} \right| + \left| {3 - ( - 5)} \right|}}{5} =8.8\% 5∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣=8.8% A anB are incorrebecause the range anvarianof the three fun are follows: The numbers shown for varianare unrstooto in \"percent square" terms so thwhen taking the square root, the result is stanrviation in percentage terms. Alternatively, expressing stanrviation anvarianin cimform, one cavoithe issue of units. In cimform, the variances for FunABFunXYZ, anFunPQR are 0.0317, 0.0243, an0.0110, respectively. 是不是只能把三个挨个算出来

2023-04-22 23:57 1 · 回答

NO.PZ2021061603000025问题如下 Annureturns ansummary statistifor three fun are listein the following exhibit:The funwith the highest absolute spersion is: A.FunPQR if the measure of spersion is the rangeB.FunXYZ if the measure of spersion is the varianceC.FunAif the measure of spersion is the meabsolute viation C is correct. The meabsolute viation (MA of FunABC's returns is greater ththe Mof both of the other fun.M=∑i=1n∣Xi−Xˉ∣nM = \frac{{\sum\limits_{i = 1}^n {\left| {{X_i} - \bX} \right|} }}{n}M=ni=1∑n∣Xi−Xˉ∣, where Xˉ{\bX}Xˉ is the arithmetic meof the series.Mfor FunA=∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣5=14.4%\frac{{\left| { - 20 - ( - 4)} \right| + \left| {23 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right| + \left| {5 - ( - 4)} \right| + \left| { - 14 - ( - 4)} \right|}}{5} = 14.4\% 5∣−20−(−4)∣+∣23−(−4)∣+∣−14−(−4)∣+∣5−(−4)∣+∣−14−(−4)∣=14.4% Mfor FunXYZ=∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣5=9.8%\frac{{\left| { - 33 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 12 - ( - 10.8)} \right| + \left| { - 8 - ( - 10.8)} \right| + \left| {11 - ( - 10.8)} \right|}}{5} = 9.8\%5∣−33−(−10.8)∣+∣−12−(−10.8)∣+∣−12−(−10.8)∣+∣−8−(−10.8)∣+∣11−(−10.8)∣=9.8% Mfor FunPQR=∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣5=8.8%\frac{{\left| { - 14 - ( - 5)} \right| + \left| { - 18 - ( - 5)} \right| + \left| {6 - ( - 5)} \right| + \left| { - 2 - ( - 5)} \right| + \left| {3 - ( - 5)} \right|}}{5} =8.8\% 5∣−14−(−5)∣+∣−18−(−5)∣+∣6−(−5)∣+∣−2−(−5)∣+∣3−(−5)∣=8.8% A anB are incorrebecause the range anvarianof the three fun are follows: The numbers shown for varianare unrstooto in \"percent square" terms so thwhen taking the square root, the result is stanrviation in percentage terms. Alternatively, expressing stanrviation anvarianin cimform, one cavoithe issue of units. In cimform, the variances for FunABFunXYZ, anFunPQR are 0.0317, 0.0243, an0.0110, respectively. 请问这里range是怎么算的？

2023-01-11 12:00 1 · 回答

请问知道标准差，是否可以直接算MAD

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