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请问这个公式在哪里讲过呢
NO.PZ2016082404000011 问题如下 John Flag, the manager of a $150 million stressebonportfolio, concts stress tests on the portfolio. The portfolio’s annualizereturn is 12%,with annualizereturn volatility of 25%. In the past two years, the portfolio encountereseverys when the ily value change of the portfolio wmore th3 stanrviations. If the portfolio woulsuffer a 4-sigma ily event, estimate the change in the value of this portfolio. $9.48 million $23.70 million $37.50 million $150 million ANSWER: AFirst, we transform the volatility into a ily measure, whiis 25%252=1.57%\frac{25\%}{\sqrt{252}}=1.57\%25225%=1.57%. 150×1.57%×4=$9.45.150\times1.57\%\times4=\$9.45.150×1.57%×4=$9.45.解析有一个基金经理管理着150m美元不良债券投资组合,他对投资组合进行压力测试。 该投资组合的年化收益率为12%,年化收益率波动率为 25%。 在过去的两年中,投资组合遇到了几天投资组合的每日价值变化超过 3 个标准差的情况。 如果投资组合每天价值变化超过4个标准差,请估计该投资组合的价值变化。ily σ=25%*(252^0.5)=1.57%组合价值在一天内变化达到4个标准差,变动值就是组合价值*4*标准差=150m*4*1.57%=9.48m选 In the past two years, the portfolio encountereseverys when the ily value change of the portfolio wmore th3 stanrviations这句是什么意思,这个条件是不需要吗
NO.PZ2016082404000011问题如下John Flag, the manager of a $150 million stressebonportfolio, concts stress tests on the portfolio. The portfolio’s annualizereturn is 12%,with annualizereturn volatility of 25%. In the past two years, the portfolio encountereseverys when the ily value change of the portfolio wmore th3 stanrviations. If the portfolio woulsuffer a 4-sigma ily event, estimate the change in the value of this portfolio. $9.48 million $23.70 million $37.50 million $150 million ANSWER: AFirst, we transform the volatility into a ily measure, whiis 25%252=1.57%\frac{25\%}{\sqrt{252}}=1.57\%25225%=1.57%. 150×1.57%×4=$9.45.150\times1.57\%\times4=\$9.45.150×1.57%×4=$9.45.解析有一个基金经理管理着150m美元不良债券投资组合,他对投资组合进行压力测试。 该投资组合的年化收益率为12%,年化收益率波动率为 25%。 在过去的两年中,投资组合遇到了几天投资组合的每日价值变化超过 3 个标准差的情况。 如果投资组合每天价值变化超过4个标准差,请估计该投资组合的价值变化。ily σ=25%*(252^0.5)=1.57%组合价值在一天内变化达到4个标准差,变动值就是组合价值*4*标准差=150m*4*1.57%=9.48m选请问既然是标准差,不是应该乘以根号4么?
老师你好,这道题明确给了收益率是12%,那么应该用12%/250-4*25%/250^(1/2)来求解吧
老师您好,请问这里的annureturn是否有均值(μ)的意思呢?如果考虑均值,计算的结果是ily均值 - 4 * ily标准差 = -8.315