beta distribution

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November 29th 2008, 12:53 PM
sp1705

beta distribution

can anyone tell me how to prove the mean and variance for the beta distribution function?
November 29th 2008, 04:12 PM
mr fantastic

Quote:

Originally Posted by sp1705

can anyone tell me how to prove the mean and variance for the beta distribution function?

You need to calculate two things: $E(X)$ and $E(X^2)$ .

Study this thread: http://www.mathhelpforum.com/math-he...oof-58973.html

It has what you need to know.
November 30th 2008, 03:32 AM
sp1705

i realise that i need to calculate E(x) and E(x^2) but how do i integrate x*beta function to get E(x)? i really dont understand the gamma function thing the r symbol? any help?
November 30th 2008, 10:49 AM
mr fantastic

Quote:

Originally Posted by sp1705

i realise that i need to calculate E(x) and E(x^2) but how do i integrate x*beta function to get E(x)? i really dont understand the gamma function thing the r symbol? any help?

Have you red the thread whose link I gave you? The details of the integration are all in there. Read it. What don't you undertsand?

"the gamma function thing the r symbol": Gamma function - Wikipedia, the free encyclopedia

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