Topics

1

General Discussion / arbitrary joint distribution for compiled network

« on: April 22, 2013, 08:03:49  »

Suppose I want to generate a joint distribution over some arbitrary set (or subset) of network model variables, e.g., Pr(X, Y, Z), where X, Y, Z are nodes/variables in the model.  Can I do this using the compiled model, e.g., using the simulation function?  Or some other way?

andersrm

2

HUGIN GUI Discussion / Using new Function Node

« on: February 23, 2013, 03:44:06  »

I would like to compute a utility based on the difference between two discrete chance interval nodes.  My understanding is that this CANNOT be done with real-valued function nodes at present since these cannot accept interval nodes as parents.  Any other suggestions on how to do this?  Other than representing the difference as a discrete chance interval node and assigning a discrete utility to each of its states..  Even if I could use a function node, and wanted to assign a utility node as a child, that utility node I suppose could only handle discrete values...

3

General Discussion / Interpreting Evidence

« on: January 14, 2013, 10:35:34  »

I have a Bayesian network containing a continuous variable x discretized into a number of possible states.  I obtain evidence/an observation that gives the average value of x. No other information is available about the evidence.  Is it reasonable and defensible to model the observation as likelihood (or soft) evidence?  I realize that without additional information about the evidence, there's still an infinite number of ways to interpret it.  Any thoughts and/or references to handling this issue (in Hugin or in general) would be appreciated.

andersm

4

General Discussion / Discretization Algorithm

« on: January 12, 2013, 22:47:36  »

Where can I obtain information/description of the discretization algorithm used by Hugin?

andersrm

5

General Discussion / Bug in 64 bit V. 7.7 ???

« on: January 02, 2013, 22:27:08  »

I double click on a decision variable and a bug report dialogue comes up, requesting a report.  After filing the report, I cannot access the "states" tab in the variable dialogue.  Don't recall this happening on V. 7.6.

andersrm

6

HUGIN GUI Discussion / Most Likely Configuration

« on: November 18, 2012, 04:38:51  »

How does one determine most likely configuration (or most probable explanation) using the Hugin GUI?  Is it even possible?  It is mentioned in the Help page on Junction Tree, but there is no explanation that I could discover on how to do it.

andersrm

7

General Discussion / Calculation of average and variance for compiled nodes

« on: November 07, 2012, 22:54:32  »

I have a compiled node output with interval nodes for a 2 state node, 0-750, 750-1500 with computed probabilities 0.9975, 0.0025.  I agree with the calculation 376.89 for the mean, but don't know how they came up with the variance of 48,287.  I got 1,402, assuming the midpoints of the ranges in the calculation.  How does Hugin calculate the variance?

8

General Discussion / Display of Hugin results for dynamic bayesian network

« on: October 15, 2012, 23:27:10  »

Anyone know of good examples of how to display results for a dynamic bayesian network for multiple variables over multiple time steps in a way that is clear, compelling, and succinct?

Richard

9

General Discussion / Extracting the value of a state from a node

« on: February 06, 2012, 09:18:15  »

I would like to create a node that extracts only the value of a single state from the node that is upstream of it.  Any ideas on how to create a node like this?