I really need help on this pls.

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I have spend sometime on this equation and can't find any relevant information how this formula come from. It is a probability.

Pr(A|B)=exp(A*B)/(1+exp(B)),

Is there anyone here know about this?Is it a theorem,rules or equation?Or just come across to the right handside equation.Thanks
 

From the definition, Pr(A|B)=Pr(A \[\bigcap\] B)/Pr(B).

I don't think the equation you posted is right.

Suppose we let A equal B. Then Pr(A|B)=Pr(B|B)=1. However we can't obtain 1 from the right of the equation. Could you tell us where you find it?
 
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This is a funny one: question out of context.

Let's say I have
f(x,y) = 5x+3y +exp(xy) , anybody know where is this from?

and

Pr(A|B)=exp(A*B)/(1+exp(B))
um... what are A, B? ....P(A) = prob. of event A. so what exp(A) would mean?...
or maybe A, B are some values. ..real? or integer?....
so P(A) could mean for a random var x
P(x<A) or maybe P(x>A) or P(x=A)......

on and on....
so...what was the question?
 

me2please said:
um... what are A, B? ....P(A) = prob. of event A. so what exp(A) would mean?...
or maybe A, B are some values. ..real? or integer?....
so P(A) could mean for a random var x
Click to expand...

i think exp(A) would mean, expectation(the event A). however, am not familiar with the equation as a general one... where did u come across it? tha would help i suppose.. pls reply.

/Am
 

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