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Subject: Re: expectated value
Date: Tue, 15 Jan 2013 20:44:07 -0600
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On 01/15/2013 12:47 PM, maryam wrote:

> -----------------------------
> Dear Torsten
> thanks your reply
> In the part of my thesis I obtain a vector of random variables that is
>  I=1xn - matrix.
> then I must to calculate "contrast (I)" , the definition of contrast is
>contrast(x)=E(x^2)/(E(x))^2
>   and E(.) denoted the expectation operator.
> how could I calculate contrast (I)?
> thank you very much
>

 From what probability distribution are those numbers drawn from?

--Nasser