After 5 years I have got around to releasing an update to my previous program xbaies version 1.3. The new version is called xbaies2. Here are some details. Platform: Windows (Sparc version available soon (3 months from now?). Restrictions: Free for educational establishment use for education and research only; any commercial use forbidden. Xbaies version 2 is a program for building chain graph-networks of discrete random variables and multistage discrete decision networks, and uses junction tree propagation for inference and finding optimal decisions. There are many features implemented for learning and monitoring probabilities of given networks. Specification of decision problems is similar to that of influence diagrams, but, instead of diagramatically including information arcs, the natural ordering iin which the decisions are taken and random variables are revealed is specified numerically. Optimal decisions (and also sub optimal decisions) may be read off by inspection of values in the cliques of a junction tree. The software is available via my home page at http://www.city.ac.uk/~rgc Robert Cowell Robert Cowell Department of Actuarial Science and Statistics City University Northampton Square London EC1V 0HB tel: (44)171 - 477 - 8454 fax (44)171 - 477 - 8838 www: http://www.city.ac.uk/~rgc
