The probability generating function of a negative binomial distribution is equal to

[sp/(1-qs)]^r-> where q = p-1

How does one use this to compute the expectation and the variance of a negative binomial distribution?

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- Oct 21st 2007, 06:55 AMclockinglyComputing expectation and variance
The probability generating function of a negative binomial distribution is equal to

**[sp/(1-qs)]^r**-> where q = p-1

How does one use this to compute the expectation and the variance of a negative binomial distribution? - Oct 21st 2007, 07:28 AMCaptainBlack
Look at your notes or text, they/it should tell you how to get the moments from the

generating function. Alternativly see this (see section 2) document.

RonL