Search found 432 matches
- Fri Jun 06, 2008 4:47 pm
- Forum: SMILE
- Topic: DBN question
- Replies: 3
- Views: 5958
Re: Extended network
Thanks for the reply Marek. I was really thinking of the example given as part of a larger network, for example we could add: C (Temporal) and the additional links: C->B C->C (order 1) (see attached file) The example is purely hypothetical, and it may be that in practice one would most likely inclu...
- Fri Jun 06, 2008 4:24 pm
- Forum: GeNIe
- Topic: sensitivity analysis
- Replies: 4
- Views: 7214
Re: sensitivity analysis
I tryed once and doesn't work very well. I had some problems with GeNIe and the software crashes. Moreover in the output window this message appear: "Utilities not specified. Policies cannot be evaluated" thus every time I work (e.g. introducing an evidence) and updating the network. Ther...
- Mon Jun 02, 2008 7:13 pm
- Forum: SMILE
- Topic: DBN question
- Replies: 3
- Views: 5958
Re: DBN question
DBN support is a great addition to the software. I do however have the following question/issue. I have a network, part of which contains the nodes: A (Initial/Anchor) B (Temporal) with the following links: A->B B->B (order 2) When I come to specify the network parameters for node B, I only get dis...
- Wed May 28, 2008 12:03 pm
- Forum: GeNIe
- Topic: sensitivity analysis
- Replies: 4
- Views: 7214
Re: sensitivity analysis
If I built a network that is not an influence diagram can I make the sensitivity analysis with the addition of a Decision node "Sensitivity" as explained in the Tutorial 12? Thank you very much! Yes, you can. Just add a decision node along the same lines as in the tutorial, update the net...
- Tue May 20, 2008 3:24 pm
- Forum: GeNIe
- Topic: sensitivity analysis
- Replies: 5
- Views: 8146
Re: target nodes (releted to sensitivity analysis explanatio
What is exactly a 'target node'? Is simply the variable you are interested in or is necessary that it has specific properties (e.g. could be performed a diagnosis test on this variable)? Well, it depends where it is -- have used this name somewhat inconsistently :-). In case of sensitivity analysis...
- Mon May 12, 2008 5:46 pm
- Forum: SMILE
- Topic: Performance and Scalability of SMILE
- Replies: 17
- Views: 19946
1. Scalability - you have described it is a function of the network topology kind of evidence etc. But when working with say, thousands of variables, are there any best practices/guidelines to follow? how would one go about optimizing the model for scalability 2. Parallelism - Can we parallelize th...
- Mon Apr 28, 2008 5:33 pm
- Forum: GeNIe
- Topic: Validation + Verification BN
- Replies: 4
- Views: 8889
- Mon Apr 28, 2008 3:35 pm
- Forum: GeNIe
- Topic: Validation + Verification BN
- Replies: 4
- Views: 8889
You need to tell us more :-). Have you built the network based on data or on expert knowledge? If on data, you can use part of the data to learn the network and a part to validate it -- this is called cross-validation. If it is based purely on expert knowledge, there are many techniques that you can...
- Thu Apr 10, 2008 8:57 pm
- Forum: GeNIe
- Topic: sensitivity analysis
- Replies: 5
- Views: 8146
Re: sensitivity analysis
Therefore the sensitivity tool is kind of one-way sensitivity analysis were each parameter is variated separately, is it correct? For 'tha tables for sensitivity mode' you mean Max Min Avg in the balloon containing information about Sensitivity? This is correct -- it is one-way sensitivity analysis...
- Wed Apr 09, 2008 8:40 pm
- Forum: SMILE
- Topic: Utilities in Influence diagrams
- Replies: 1
- Views: 4037
Re: Utilities in Influence diagrams
Hi all, I have a naive question :( I have an influence diagram matching a real-world experiment. This diagram has only one utility node, and in the experiment I can observe the value corresponding to this utility node. Since the utility node maps utility value to the values in the parents node in t...
- Tue Apr 08, 2008 12:48 pm
- Forum: GeNIe
- Topic: sensitivity analysis
- Replies: 5
- Views: 8146
Re: sensitivity analysis
I am a GeNIe new user. I built a network and now I would like to do the sensitivity analysis using the sensitivity tool. I tried it but I didn't understand how it works. I found the Helps information too general instead the reference paper too difficult (sorry, I am not a statistician :oops: ). Cou...
- Tue Dec 11, 2007 4:37 pm
- Forum: GeNIe
- Topic: Algorithm for Computing Observation Relevancy
- Replies: 1
- Views: 5133
Re: Algorithm for Computing Observation Relevancy
I am looking for the algorithm Genie is using to compute the relevancy of observations in test view. Thanks We use a simple algorithm that computes the expected gain in cross-entropy between the target fault and the observation. One place where you will find more information about the algorithms ap...