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Social phenomena and standard statistical testsAttitudes and informal structures within an AFL team:Research questions, measures and dataCompeting explanations: individual and structural effectsA brief diversion into exponential random graph modelsModel form, estimation, specificationAttitudes
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1. The Analysis of Individual Attitudes withinComplex Relational StructuresFootballers, teams and attitudes towards masculinity Garry Robins
Dean Lusher
University of Melbourne
Peter Kremer
Ballarat University
ARCRNSISS National Conference 2006
Theory, Methods and Applications of Spatially Integrated Social Science
Melbourne, May 2006
2. Social phenomena and standard statistical tests
Attitudes and informal structures within an AFL team:
Research questions, measures and data
Competing explanations: individual and structural effects
A brief diversion into exponential random graph models
Model form, estimation, specification
Attitudes and informal structures within an AFL team:
Models, results and conclusions
Final comments
Modelling social phenomena: Complex data dependencies
3. A standard statistical test(the t-test)
4. A standard statistical test(the t-test)
5. A standard statistical test(the t-test)
6. A standard statistical test(the t-test)
7. The test depends on independent observations
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The test depends on independent observations
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The test depends on independent observations
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11.
12. Critiques of the decontextualisation of social contexts “(A social) system does not reside in the individuals taken separately, though each individual contributes to it; nor does it reside outside them; it is present in the interrelations between the activities of individuals … One could say that all the facts of the system can be expressed as the sum of the actions of individuals. This statement is misleading, however, if one fails to add that the individuals would not be capable of these particular actions unless they were responding to (or envisaging the possibility of) the system.”
(Asch, 1952, p. 252)
“The very assumption of statistical independence … detaches individuals from social structures and forces analysts to treat them as parts of a disconnected mass. Researchers following this tack … are forced to neglect social properties that are more than the sum of individual acts.”
(Wellman, 1988, p.38).
13. Critiques of the decontextualisation of social contexts “… the rapidly advancing discipline of sampling … separated individuals from their social context of friends, acquaintances, and so on, but also deliberately ignored an individual variable’s context of other variables in the name of achieving “more complete” knowledge of the variable space. Sampling not only tamed contextual effects to mere interactions, it also thereby produced data sets in which the levels of contextual causation were deliberately minimized. This would later enable a whole generation of sociologists to act as if interaction were a methodological nuisance rather than the way social reality happens.”
(Abbott, 1997, p. 1162: emphasis in original)
The preoccupation with individual cognition has left researchers “ill-equipped to do much more with the so-called cognitive revolution than apply it to organizational concerns, one brain at a time”.
(Weick and Roberts, 1993, p.358).
14. An empirical example: Masculine behaviour and social networks in team structures1.Research questions and measures2. Competing explanations: individual and structural effects
16. Research Issues What sort of attitudes towards women do AFL players have?
Are attitudes towards women associated with the social structure of AFL teams?
What effect does the club culture have on attitudes?
17. Individual level questions
18. Games played
Playing status
Position
Age
Marital status
Cultural background
Working or studying outside of sport
Individual level questions
19. Social Network Data All of the incidents reported in the media occurred after hours
27. The basic question:
28. But …
29. And structural effects …
30. A brief diversion into exponential random graph modelsModel form, estimation, model specification
31. Exponential random graph (p*)models(Frank & Strauss, 1986; Wasserman & Pattison, 1996; Snijders, Pattison, Robins & Handcock, 2005)
32. Exponential random graph models P(X = x) = (1/c) exp{?Q ?QzQ(x,y)}
normalizing quantity parameter network statistic
the summation is over all configurations Q
zQ(x) = ?Xij?Qxij signifies whether c = ?xexp{?Q ?QzQ(x,y)}
all ties in Q are observed in x
33. Markov Chain Monte Carlo MLE for exponential random graph models P?(X = x) = (1/?) exp{??z(x)} = exp{??z(x) - ?(?)} (1)
Since (1) is an exponential family of distributions
ML estimate ?*(x) is the solution of ?(?) = z(x), where ?(?) = E?{z(X)}
asymptotic covariance matrix of ?* is given by (?(?))-1 = [cov(z(X))]-1
But ?(?) and ?(?) are not computable, hence need for MCMCMLE
Two different approaches to MCMCMLE:
Handcock (2003), following Geyer and Thompson (1992) statnet
Snijders (2002) SIENA (also pnet)
34. Model specification for network structure without attributes Markov random graph models (Frank & Strauss, 1986)
New specifications (Snijders, Pattison, Robins & Handcock, 2005)
35. Model specification for network structure with attributes
Many possible effects but the simplest involves edge level effect within and between node classes
36. An empirical example: Masculine behaviour and social networks in team structures3. Models, results and conclusions
37. Exponential random graph model for the AFL study: Structural effects in the model
38. Exponential random graph model for the AFL study: Attribute effects in the model
39. Parameter estimates: Major structural effects
40. Parameter estimates: Major attribute effects
41. Conclusions of the research
42. Final comments