Introduction

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Introduction

It is often of interest to a user which variables can be best manipulated in order to affect a specified node most. To this effect, QGeNIe allows for specifying a Focus node, denoted by a small target icon on the graph. Given a focus node, QGeNIe supports calculating the value of information flowing from observations and the value of intervention (also known as manipulation of control). For that calculation to be performed, the model builder should specify for every node in the model whether it is possible to observe it and whether it is possible to manipulate it. Observable and Manipulable properties are part of the General property sheet.

project_node_properties_general

The Technical Problems node pictured above is Observable but not Manipulable.

The following two sections show how to enable value of information and value of intervention calculation and how to perform and interpret its results.