Re: Expected value
- From: usenet@xxxxxxxxxxxx
- Date: Wed, 28 Sep 2005 15:32:57 -0500
No, not that simple.
First find out distribution of Z1=X|Y=D, Z2=X|Y=G
P(Y=D)=0.1+0.1+0.05=0.25
So
Z1=0, p=0.1/0.25=0.4
Z1=1, p=0.1/0.25=0.4
Z1=2, p=0.05/0.25=0.2
And E[Z1]=0*0.4+1*0.4+2*0.2=0.8.
Z2 is similar.
grimster Wrote:
> simple discrete case with this distribution:
>
> X is the rows and Y the columns
> - D - G
> 0 - 0,1 - 0,15
> 1 - 0,1 - 0,3
> 2 - 0,05 - 0,3
>
> i'm supposed to calculate the conditional expected values.
> that is
> E(X|Y=D) and E(X|Y=G)
>
> are the answers 0,1+0,1=0,2 and 0,3+0,6=0,9 ? is it really that
> simple?
--
royfei
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