Overview

You can use the Event Graph widget to generate an automated link analysis chart of associations (events & facts).  This is useful for visualizations of subsets of social networks, or for viewing topical/thematic relationships between content publishers.

About the Event Graph

Events vs. Facts

By default the Event Graph widget will display both events and facts.

Associations are sub-categorized into one of three types: Event, Fact, or Summary.

• Event: link multiple entities (via "entity1_index", "entity2_index", "geo_index") and represent a transient activity (i.e. travel)

• Fact: link multiple entities like "Events" but represent (transient or permanent) relationships (i.e. being president)

• Summary: generally link one entity to a free text (i.e. a quotation: "Obama says...").

Edge Density

Each object in a graph is called a node (or vertex). Corresponding to the connections (or lack thereof) in a network are edges (or links) in a graph. Each edge in a graph joins two distinct nodes.

More formally, we define a graph G as an ordered pair G = (V,E) where 

• V is a set of nodes (vertices).
• E is a set of edges (links).
• Each edge is a pair of vertices. In other words, each element of E is a pair of elements of V.

Using the Event Graph widget, it is possible to change edge density, corresponding to the amount of related "events" or "facts" that are depicted on the graph.  Using a slider you can increase or decrease the amount of events/facts, thereby changing the edge density.  This procedure is documented below.

About Associations

An association is an activity or relationship between entities. It can be thought of as "subject / verb / object / at location / over time", where the subjects and objects can be free text and/or point to entities within the document.  This type of subject/verb/object association is considered to be a "hard" association.  Soft associations, on the other hand, are comprised of entities that are linked via co-reference.  For example, entities that share similar documents can be said to be linked together by co-reference.

Using the Widget

Filtering the Graph to Only Show One Entity

Sometimes you will want to hone in on the events associated with a single entity.

To filter for just one entity

1. Set filter to "Events."
2. In the "Show only:" dialog box, type the name of the entity.  The graph automatically updates to only show the specified entity and related events.

Increase/Decrease Number of Related Events

It is possible to increase or decrease the amount of related events for the entities using the widget slider

To show more or less events

1. From the Event Graph widget, ensure that the settings gear is expanded
2. Use the slider to either increase or decrease the top events shown.

Changing Ranking

It is possible to change the ranking of entities from Significance to Doc. Count.

To change the ranking

1. Select the settings icon. 
2. Select the drop-down under 'Rank By'.
3. Change to Doc Count.

Adding an Association to a Query

You can drag and drop a specific association between two entities and add it to the query bar

To add an association to query

1. Click + hold on the association (edge) label between two entities
2. Drag + drop on the query bar.
   

Dragging to the Case Visualizer 

 You can drag an association from the Event Graph to the Case Visualizer.

To add an association to the Case Visualizer widget

1. Click + hold on the association (edge) label between two entities
2. Drag + drop onto the graph

About Event Graph to Case Visualizer 

 Individual entities (nodes) cannot be selected and dragged from the Event Graph.

 Only associations (edges) can be dragged from the Event Graph to the Case Visualizer.

 Mousing over an edge label (i.e. generic relations) will change mouse selector to allow for drag + drop onto the Case Visualizer.

 Entities dragged from the Event Graph will contain a URL in the node properties.