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November 29th, 2008, 02:53 PM
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| |  beta distribution
can anyone tell me how to prove the mean and variance for the beta distribution function? |
November 29th, 2008, 06:12 PM
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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:  and  .
Study this thread: beta distribution probability density function proof
It has what you need to know.
__________________ There are two things you should never try to prove: the impossible and the obvious. The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)
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November 30th, 2008, 05:32 AM
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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, 12:49 PM
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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
__________________ There are two things you should never try to prove: the impossible and the obvious. The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)
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