老师，贝叶斯公公式，求的就是条件概率，对么？ 分母是全概率公式，分子是联合概率，可以这么理解么

老师您好，l怎么会小于R啊

请问YTM不可以用计算器算出来吗？一定要用公式？

为什么我算了好几遍effective convexity都是214.6057😭

请问为什么违约概率是1-99.5%？

请问为什么违约概率是1-99.5%？

老师好，Ｄ项不理解，感谢感谢

同样久期的零息债券和付息债券凸性谁大谁小？

习题499 想让老师帮忙解释一下 I II III三句话

An analyst is studying a stock that is currently trading at $35. The analyst estimates that there is 33% probability that the stock will trade at $50 after one year, a 20% probability that the stock will trade at $42, and a 47% probability that the stock will trade at $20. What is the volatility of this stock return? 答案是方差=E(X^2)=15.46%，有点晕了，均值是E(X)，第二个不是E(X^2)=15.46%吗？为什么用方差=E(X^2)-E(X)^2=15.46%-2%^2 算出来的波动率会不一样？