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Quant版 - 一道老题
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t*******y
发帖数: 637
1
1. Let X-N(0, 1) be a normally distributed random variable with mean 0 and
variance 1. Suppose that x in R, x > 0. Find upper and lower bounds for
the conditional expectation E(X | X >= x)
S*****H
发帖数: 90
2
lower bound: (x+sqrt(x^2+8/pi))/2
upper bound: (x+sqrt(x^2+4))/2
See reference:
http://mathworld.wolfram.com/Erfc.html
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