Thread: bounds for marginal density
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Old November 22nd, 2008, 07:03 PM
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Quote:
Originally Posted by lllll View Post
f(x, \ y) = \left\{ \begin{array}{rcl}e^{-(x+y)} & \mbox{for} & x>0, \ y>0 \\ 0 & \mbox{otherwise} \end{array}\right.

find the marginal density for x

f_1(x) = \int_0^y e^{-(x+y)} \ dy

[snip]
No, the marginal density of x is given by

\int_0^\infty e^{-(x+y)} \, dy
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