Co-occurrences

The name should typically end in "Co-occurrence" or "Co-occ"

The name will be updated automatically based on the endpoints when you change the Entity 1 and Entity 2 dropdowns.

After you edit the relation type name, it will become bold, indicating that further changes to dropdowns will not change it.

 

Co-occurrences can be created between the same two entity types (two senators) or two different entity types (a state and a bill).

When editing a co-occurrence that has already been created you cannot change the endpoints.  To do so the co-occurrence must be deleted and a new one can be created in its place.

If Entity Type 1 and Entity Type 2 are the same (two senators), the constituent relations must have one endpoint (Src or Dst) be a Senator, and the other should be a different entity type (a bill).

If Entity Type 1 and Entity Type 2 are two different entity types (a bill and a state), the constituent relations must go from Entity Type 1 (a bill) to a third entity type (a senator), and also from the third entity type to Entity Type 2 (a state).

There can be more than one or two constituent type relations as long as they connect Entity Type 1 to Entity Type 2 through an intermediate types.  For instance a co-occurrence between senators can incorporate both Senator-Bill relation types and Senator-State relation types.

Co-occ #:  Co-occurrence # is the number of entities which make up the other endpoints of constituent relations emanating from the co-occurrences endpoints.  For instance, for a co-authorship co-occurrence between two authors we would count the number of documents that the two authors have written together, which would be their co-occurrence #.

 

C-Rank: C-Rank is a rank of co-occurrences by Co-occurrence #.  A rank of 1 indicates the strongest relationship and higher values of C-Rank indicate a weaker relationship.  For a co-occurrence between entities A and B, the C-Rank is computed by sorting co-occurrences between A and all entities of type B and looking at the order in which our co-occurrence appears.  We then compare this to the sorted list of co-occurrences for B and all entities of type A.  C-Rank is the minimum of these two numbers.

 

Signif: Significance is probability that A and B would have the co-occurrence # that they do divided by the expected value of the overlap between two entities having the same number of constituent relations as A and B but occurring at random.  I.e. it is the importance of the overlap rather than the size of the intersection.  For instance, if we have a list of 100 documents, and two authors which have written 50 each, then by random chance the authors should have written 25 together.  If they have co-authored more than 25 documents then the significance has a positive value.  If the two authors had each written 25 documents documents to begin with, and they again have a co-occurrence of 25 out of a pool of 100, then the significance of them having co-authored 25 documents is this case is much larger when they had written 50 documents each.

 

S-Rank: S-Rank is similar to C-Rank except it is computed by sorting co-occurrences by significance rather than by co-occurrence #.

 

OK: Add the co-occurrence dynamic relation type or apply changes to the relation type and return to the Dynamic Relations page.

Cancel: Discard changes and return to the Dynamic Relations page.