*1) What is CSV format?* Comma Seperated values is a text data format with each value in a row of data delimited with a comm(,). It is available from the Save As dialogue on spreadsheet programs such as Microsoft Excel and is frequently used as an human-readable data interchange format. It can also be easily created using text editors.

e.g.

Node A, Node B, Node C

26,12,34

35,23,48...etc

*2) What is Structure learning?* This is where the program learns the structure of a bayesian belief network from a data-file (which contains a set of cases i.e. observed data).

Hugin can use a variety of statistical algorithms which analyse the conditional independence of nodes in the network. They have differing strengths and weaknesses e.g. speed, completeness or level of expert human intervention.

__Algorithms available include:__

PC algorithm - see http://download.hugin.com/webdocs/manuals/7.3/Htmlhelp/descr_PC_algorithm_pane.html

NPC algorithm - see http://download.hugin.com/webdocs/manuals/7.3/Htmlhelp/descr_NPC_algorithm_pane.html

Greedy search-and-score algorithm

Chow-Liu tree algorithm - see http://en.wikipedia.org/wiki/Chow-Liu_tree

Rebane-Pearl polytree algoritm -see http://en.wikipedia.org/wiki/Polytree

Tree Augmented Naive Bayes algorithm.

*3) What is a Domain model?* A Doman model is a mathematical model of a problem domain. On this web-site a Domain model will refer to a Bayesian network (or an influence which, in principle, is a Bayesian network augmented with decision facilities such as utility functions, decision variables and information orderings).

**HUGIN/IFR BIOTRACER**

Demonstration Activity

*"A data input tool"*