BayesFusion Support Forum

Don't the formulas in my earlier post help? P(E)=P(E|AB)P(AB)+P(E|A~B)P(A~B)+P(E|~AB)P(~AB)+P(E|~A~B)P(~A~B) vs. P(E)=P(E|AB)P(A)P(B)+P(E|A~B)P(A)P(~B)+P(E|~AB)P(~A)P(B)+P(E|~A~B)P(~A)P(~B) You can construct a simple model in GeNIe and plug in some numbers in the CPTs to see whether the theoretical ...

What exactly do you mean by a fuzzy Bayesian network? There is a good chance that GeNIe does not implement it. We implement standard Bayesian networks, hybrid Bayesian networks (a mixture of discrete and continuous variables, very close to systems of simultaneous structural equations), dynamic Bayes...

What exactly do you mean by a Fuzzy RB?
Cheers,

Marek

The meaning of the diagnostic values is purely theoretical and there are no units. They are essentially cross-entropies between a node and the fault in question. When it is 0.006, I agree that it is rather small. The interpretation is that when you learn the value of this node, you will not learn mu...

Please excuse me for a delay in answering -- I was traveling and had a lot to catch up after the travel. Thank you for the clear explanation of the problem. Now I see what you are after. I think the attached model will do the trick. You will need to enter evidence for the nodes Observation? (either ...

Hi Bahman, I have looked at your network and it is not really Node13 that is the culprit. Please note that your network will not update even if you remove this node. Generally, it is not that easy to predict the size of the junction tree in advance without trying triangulation. Your network is quite...

I’m on the road, so I will be very brief. A small percentage of invalid samples is generally not a problem. Gray arcs tell you that there is something wrong with the definition of the child. They mean, essentially, that they are not necessary (the child is independent of the parent), which means tha...

Thank you for the network. I can see that the domain of the node Blood_Sugar is [0.4,4.4] and the definition is Blood_Sugar=Weibull(451.545,0.365594). The samples from your Weibull span between practically zero and almost 400K. Many, many samples fall outside of the interval [0.4,4.4] and this is wh...

Hi Nira, It is hard to say without looking at the node in question and its parents and their definitions (mainly domains). Essentially, GeNIe complains here that there have not been enough samples to derive a precise CPT for the node in question. There may be many reasons for that, so suggesting how...

This is a "million dollars question" :-). Populating CPTs (Conditional Probability Tables) is generally a laborious task. If you have data that you can learn from, it helps a lot -- the tables can be learned from data. If not, then manual labor, getting the numbers from expert knowledge. O...

Your screen shot shows that the definition of the node Munkaterulet is trivial, i.e., none of the parents influences/makes any difference to the posterior marginal probability of the node. You can also see it in the color of the incoming arcs, which are all grey. This means that the node Munkaterule...

Hi Bahman, I hope I understand the question correctly. My understanding is that C has two parents, dt and Z. Also, there are possibly multiple outcomes of ZD, of which one is "z_1". In that case, your definition of C should be something like: C = If(ZD="z_1",Exponential(1),dt) If...

I'm afraid I don't know the domain well enough to advise here. In social sciences, people often use linear equations but it is often because they don't have a good functional description of the mechanisms working in the system. In physics and often in engineering we do have a good idea what the equa...

You are most welcome! SMILE always uses EM, which more or less (I'm skipping the fine details of the implementation) deteriorates to simple counting when the data set contains all values.
Cheers,

Marek

Hi Nour, I'm afraid I am not aware of any tool that can do that. Parameter (and equation?) learning in a hybrid system is a complex problem and it depends very much on the form of the equation, distributions, etc. No general solution. When we move into that direction, which we definitely will, we wi...