Chapter 7 Networks Flashcards
Graph
(sociogram) a visual representation of relations between actors in a network
Nodes
actors within a network, in social networks, these are often individuals
edges
the ties in the network
2 types of edges
directed (relationship between actors is specified- can be assymmetrical) Undirected: relationship between actors is unspecified (symmetrical=two sided= reciprocal)
personal network
a network presenting all the ties that a certain person (ego) has to others (alters)
Dyads
each (possible) relationship between ego and alter
adjecency matrix
a matrix representing who has a relation to whom in a network (sender-receiver) (tabel schema)
indegree
the number of nominations a person receives from other
outdegree
the number of nominations a person makes
strong ties
postive relationships in which people feel emotionally close to one another, trust each other and help each other out when needed
weak ties
(acquintances) a more superficial of instrumental relationship between two people who see each other not that often and are emotionally less clos to one another (minimum positive tie)
Distincition in ties made (3)
1) emotional closeness 2) frequency of interaction 3) reciprocity
in negative relations..
people undermine the well-being, personal development and resources of other person
Hierarchical network layers
(every network also consists of the layers before) Core (spouse/few best friends)-sympathy (close family members/friends)- Affinity (peers/more distant family members (relatively frequent contact))- Active(maintain active relation)-total personal network (people merely known on first basis and people hardly contact)
name generator
a survey question which asks the respondent to mention the names or initials of alters in their personal network
hub
highly connected and central nodes in network
hubs in personal network
The distribution of personal networks size follows a power law (highly skewed, long tail, around 500/600). A small number of individuals have very many social ties0
network density (measure)
the ratio of all realized ties in a network to the number of all possible ties in the same network ( K(k-1)/2= possible ties, d= realized ties/possible ties) gaat over tussen alters, niet tussen ego en alters!
triad
a network of three actors and the (possible) ties between them
triadic closure
(transivity) the situation in which the two alters of one ego are also connected to each other
transivity tendency
if ego A has ties to alters B and C, then B and C are more likely to be (positively) connected compared with the situation in which ego A has a tie to either B or C (or to neither). (your connections likely know each other well)
reasons transivity tendency
1) meeting opportunities 2) homophily 3) structural balance ( strength ties moderate this - Granovetter)
forbidden triad
a triad in which ego A has strong ties to alters B and C, bu t in which no tie exists between B and C
small world phenomenon
in a large scale contempary societies, two randomly chosen individuals are personally connected in only a few steps (5/6), via their friends, acquaintances and family