Difference between revisions of "MCSN Tuesday, 1-Nov-11"

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** cliques:  are defined to be maximal.  So a triad isn't necessarily a clique, though if it's not a clique on its own it must be ''part'' of a larger clique.  Note also that a ''square'' is not a clique unless it contains its ''diagonals''.
 
** cliques:  are defined to be maximal.  So a triad isn't necessarily a clique, though if it's not a clique on its own it must be ''part'' of a larger clique.  Note also that a ''square'' is not a clique unless it contains its ''diagonals''.
 
= 4.8 =  
 
= 4.8 =  
 +
* How to define the flying teams?
 
= Affiliation networks =
 
= Affiliation networks =
 
* People affiliate to groups (often defined by space, like the University of Alberta), and events (typically defined by space-time, like this class session), whether by choice or circumstance.  
 
* People affiliate to groups (often defined by space, like the University of Alberta), and events (typically defined by space-time, like this class session), whether by choice or circumstance.  
 
* Such affiliations define ''bipartite'' networks comprising two kinds of vertex, which we can call ''actors'' and ''events'' (don't be confused - ''events'' could be more like groups)
 
* Such affiliations define ''bipartite'' networks comprising two kinds of vertex, which we can call ''actors'' and ''events'' (don't be confused - ''events'' could be more like groups)
 +
* Affiliations define ''social circles'' which overlap.
 
* In a ''bipartite'' network there are two kinds of vertex, type A and type B.  All lines connect a type A vertex to a type B vertex - there are no direct connections between vertices of type A, nor are there direct connections between vertices of type B.   
 
* In a ''bipartite'' network there are two kinds of vertex, type A and type B.  All lines connect a type A vertex to a type B vertex - there are no direct connections between vertices of type A, nor are there direct connections between vertices of type B.   
 
* Example:  [http://www.theyrule.net/ Interlocking directorates]
 
* Example:  [http://www.theyrule.net/ Interlocking directorates]
 +
* Typical  assumptions about affiliation networks (critique! test!) (see p. 101):
 +
# Affiliations are institutional or structural -  less personal than friendships or sentiments.
 +
# "Although membership lists do not tell us exactly which people interact, communicate, and like each other, we may assume that there is a fair chance that they will."
 +
# Actors at the intersection of ''multiple'' social circles...
 +
## tend to interact even more
 +
## enable indirect communication between the circles as a whole.
 +
# "Joint membership in a social circle often entails similarities in other social domains."  (i.e. ''homophily'' principle...Cause or effect?)

Revision as of 07:23, 1 November 2011

Quiz

  • page 1 - bravo!
  • page 2, mainly bravo, but a few common misconceptions remain:
    • components can't overlap (because they're maximal)
    • cores: can't be determined from degree. For one thing, a vertex in the 4-core has to be connected to at least 4 others in the 4-core (by definition!). Therefore the smallest 4-core will have 5 vertices. Some people indicated a single node as belonging to the 4-core.
    • cliques: are defined to be maximal. So a triad isn't necessarily a clique, though if it's not a clique on its own it must be part of a larger clique. Note also that a square is not a clique unless it contains its diagonals.

4.8

  • How to define the flying teams?

Affiliation networks

  • People affiliate to groups (often defined by space, like the University of Alberta), and events (typically defined by space-time, like this class session), whether by choice or circumstance.
  • Such affiliations define bipartite networks comprising two kinds of vertex, which we can call actors and events (don't be confused - events could be more like groups)
  • Affiliations define social circles which overlap.
  • In a bipartite network there are two kinds of vertex, type A and type B. All lines connect a type A vertex to a type B vertex - there are no direct connections between vertices of type A, nor are there direct connections between vertices of type B.
  • Example: Interlocking directorates
  • Typical assumptions about affiliation networks (critique! test!) (see p. 101):
  1. Affiliations are institutional or structural - less personal than friendships or sentiments.
  2. "Although membership lists do not tell us exactly which people interact, communicate, and like each other, we may assume that there is a fair chance that they will."
  3. Actors at the intersection of multiple social circles...
    1. tend to interact even more
    2. enable indirect communication between the circles as a whole.
  4. "Joint membership in a social circle often entails similarities in other social domains." (i.e. homophily principle...Cause or effect?)