Node status icons

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Node status icons

Each node in the Graph View is marked by one or more node status icons. These are tiny icons displayed in the lower right corner of the node icon. There are four different node status icons: Observed, Implied, Controlled and Focus. We will explain their meaning on simple examples.

Observed Status Icon

The Observed status icon (e.g., observation_icon_false_observed) is displayed bold when the user enters evidence into a node and it signifies that the node is an evidence node. Nodes Hot Weather and Climate Control in the Building in the following model are evidence nodes and are marked with the Observed status icons:

productivity_updated1

Implied Status Icon

Sometimes, observing a node implies the values of other nodes. For example, observing that a patient is male in a medical decision support system will imply that he is not pregnant. This is possible because the program realizes that for a male patient pregnancy is impossible. QGeNIe marks the nodes whose values are implied by observations of other nodes by the Implied status icons. The Implied status icon is identical to the Observed status icon, but have yellow background (e.g., implied_evidence_icon). In the following example, the Sex variable has been observed to be False and the value of the Pregnancy variable has been determined by GeNIe to be False.

implied_evidence_network

Controlled Status Icon

Controlling the value of a node is different from observing it (see Changes in structure section). When a node is controlled, QGeNIe marks it with the Controlled status icon (control_value_icon). Node Penalties in the model below has been manipulated and marked as Controlled.

control_value_result

Focus Status Icon

The Focus status icon (target_icon) has to do with QGeNIe's support for calculations of the value of information and value of manipulation. Node Negative Profit in the above model has been designated as Focus.