Logically Impossible CPT

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Norm
Posts: 1
Joined: Fri Nov 24, 2023 11:14 am

Logically Impossible CPT

Post by Norm »

Hello,

I have derived the following Conditional Probability Table to be entered into my model:

0.0625 0.101539 0.285714 0.084643 0 0.169811 0 0.122642 0 0 0 0
0.9375 0.898461 0.714286 0.915357 0 0.830189 1 0.877358 1 1 1 1

You will note the 0 0 which is a logically impossible case.

Genie expects the sum of each case to be 1.

Is there a work around without affecting the accuracy of the model.
marek [BayesFusion]
Site Admin
Posts: 449
Joined: Tue Dec 11, 2007 4:24 pm

Re: Logically Impossible CPT

Post by marek [BayesFusion] »

A probability distribution that does not add up to one is impossible and wrong. GeNIe will not let you exit the dialog in which you enter such distribution. I don't know for sure, just guessing, but I think that you may want to represent a dummy probability distribution that will never be used in solving the model. In such case, just enter anything, as it is not going to be used. If I understood you wrongly, please explain your reason for wanting to have a probability distribution that consists of all zeros.
Cheers,

Marek
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