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x+y-xy Probabilistic Sum - V. quick question, quick reply needed

babo9 · 2009-04-17 11:35:48

Hi, Its been a while since I dealt with Probabilistic sum so I can't quite remember.. If you have 3 variables, say x,y and z is it extended be be ProbSum(x,y,z) = x+y+z -xyz or is it something like ProbSum(x,y,z) = ProbSum(x,ProbSum(y,z)) Thanks

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17-04-2009 12:35pm

#1

babo9

Registered Users Posts: 605 ✭✭✭

Join Date: January 2009

Posts: 543

Hi,
Its been a while since I dealt with Probabilistic sum so I can't quite remember..
If you have 3 variables, say x,y and z is it extended be be
ProbSum(x,y,z) = x+y+z -xyz
or is it something like
ProbSum(x,y,z) = ProbSum(x,ProbSum(y,z))

Thanks

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#2 17-04-2009 12:41pm
Thomas_S_Hunterson

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Join Date: July 2005

Posts: 5948

would be x + y + z - xy - xz - yz + xyz i think (equivalent to your second option)

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