social network analysis (sna) demonstration...“social network analysis is neither a theory nor a...
TRANSCRIPT
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Social Network Analysis (SNA) Demonstration
Innovations in Collaborative Modeling – Track 2
Jennifer Watling Neal
Department of Psychology Michigan State University
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SNA is not synonymous with:
Networking
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SNA is not synonymous with:
The study of online networks
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But SNA can be used to study...
The effects of networking on relationships
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But SNA can be used to study...
The effects of networking on relationships
The characteristics of online networks
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SNA is actually much broader...
“Social network analysis is neither a theory nor a methodology. Rather, it is a perspective or a paradigm”(Marin & Wellman, 2010)
– Focuses on characterizing systems by examining the pattern of relationships between a set of actors
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SNA is actually much broader...
“Social network analysis is neither a theory nor a methodology. Rather, it is a perspective or a paradigm”(Marin & Wellman, 2010)
– Focuses on characterizing systems by examining the pattern of relationships between a set of actors
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Actors
Referred to as nodes in SNA
Multiple levels of analysis
- People
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Actors
Referred to as nodes in SNA
Multiple levels of analysis
- People - Organizations
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Systems
Setting where the actors reside
– Organizations, schools, classrooms
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Systems
Setting where the actors reside
– Organizations, schools, classrooms
– Or larger systems like coalitions, communities
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Relationships
Referred to as edges in SNA
Actors can be connected in many ways
- People by (a) friendship, (b)advice, (c) trust
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Relationships
Referred to as edges in SNA
Actors can be connected in many ways
- People by (a) friendship, (b)advice, (c) trust
- Organizations by
(a) resource sharing, (b) info exchange,
(c) referrals
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General Principles (Wellman, 1988)
Relationships over attributes Common to explain social phenomenon using analyses of attributes
Economic Disparities: Women earn less than men in the same profession.
But, attributes are proxies for structural relationships
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General Principles (Wellman, 1988)
Relationships over attributes Common to explain social phenomenon using analyses of attributes
Economic Disparities: Women earn less than men in the same profession.
But, attributes are proxies for structural relationships Network Explanation: Women go to different people for instrumental and expressive support in the workplace, limiting strong relationships that are important for promotions (Ibarra, 1992)
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General Principles (Wellman, 1988)
Dyads exist in a larger relational context Focusing on dyads only misses important pieces of the relational structure that guide individual behavior
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General Principles (Wellman, 1988)
A BAny pair of actors is a dyad Actors A and B appear unrelated ....
Dyads exist in a larger relational context Focusing on dyads only misses important pieces of the relational structure that guide individual behavior
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General Principles (Wellman, 1988)
Dyads exist in a larger relational context Focusing on dyads only misses important pieces of the relational structure that guide individual behavior
A B
C
....but actually they have a mutual friend that connects them
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General Principles (Wellman, 1988)
Networks, not groups Focus is on relationships within and across groups rather than discrete group membership
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General Principles (Wellman, 1988)
Networks, not groups Focus is on relationships within and across groups rather than discrete group membership
Most studies focus on discrete groups like service providers who work for the same organizations.....
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General Principles (Wellman, 1988)
Networks, not groups Focus is on relationships within and across groups rather than discrete group membership
...but important ties like service referrals may cut across groups
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Data Collection – Bounding & Sample
Specify a population boundary – Naturally Occurring
• A Classroom • A geographic area
– Attribute • Psychology professors • Homeless Service Organizations
All actors in population included in SNA
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Data Collection – Relationships
Relationships can be measured in multiple scales:
– Binary: The relationship is present (1) or absent (0)
– Ordinal: The relationship is strong (2), weak (1), or absent (0)
– Interval: The relationship has a specific value (e.g., Number of emails between people)
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Data Collection – Relationships
Relationships can be measured as:
Symmetric: Two actors are simply linked by a relationship (e.g., Jerry and Elaine are friends)
Jerry −−- Elaine Directional: One actor sends or receives a relationship to/from another (e.g., Jerry reports to Elaine)
Jerry à Elaine
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Data Collection – Methods (Marsden, 1990)
Questionnaires & Interviews Most common sources of network data
• Actors’ report of presence or absence of ties
• Informants used when actors are orgs
Format considerations (Wasserman & Faust, 1994)
• Roster vs. Free Recall • Free vs. Fixed Choice • Binary, Ratings, or Rankings
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Data Collection – Methods (Marsden, 1990)
Questionnaires & Interviews
Please circle the names of all the people you hang out with often:
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Data Collection – Methods (Marsden, 1990)
Questionnaires & Interviews
Please circle the names of all the people you hang out with often:
!"#$%& '(")%*& +,$-*(& ."%/0& 1",2"&
!)3**& '3)()$& 4*##0& .$#3"%& 5"330&
62#),& 7($#*%/*& 8#"3*#& 93"#& 5*##*%/*&
6:#(0& ;*$#<*& ="##0& >":(& ?"@)*#&
A"##*%& B"##)*C& D"-*(& E$-*#C& F"/2"#0&
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Data Collection – Methods (Provan et al., 2005)
Questionnaires & Interviews
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Data Collection – Methods (Provan et al., 2005)
Questionnaires & Interviews
✓ ✓ ✓ ✓ ✓
✓ ✓
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Data Collection – Methods (Marsden, 1990)
Observations – Used in small settings where actors have
face to face interactions
– Benefits • Measures actual interactions
• Does not require verbal responses
– Drawbacks • Time & resource intensive • Not always feasible
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Data Collection – Methods (Marsden, 1990)
Archival Records – Network data are obtained from records
• Newspapers • Board meeting minutes • Email logs
– Benefits • Low budget • Can be used to study historical networks
– Drawbacks • Measures are often indirect proxies
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Data Collection – Ethics
Confidentiality: Network data cannot be anonymous. – Limit access to identifiable data – Destroy identifiers as soon as possible
Secondary Participation: Non-respondents can still be named by others.
Providing Feedback: Easy to compromise confidentiality and feedback can be misused.
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Representing Network Data
Matrix Sociogram
Jerry Elaine George Kramer
Jerry -‐-‐ 1 1 1
Elaine 1 -‐-‐ 1 0
George 1 1 -‐-‐ 0
Kramer 1 0 0 -‐-‐
JerryElaine
George
Kramer
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Representing Network Data
Matrix Sociogram
Jerry Elaine George Kramer
Jerry -‐-‐ 1 1 1
Elaine 1 -‐-‐ 1 0
George 1 1 -‐-‐ 0
Kramer 1 0 0 -‐-‐
Each circle is an actor in the network
JerryElaine
George
Kramer
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Representing Network Data
Matrix Sociogram
Jerry Elaine George Kramer
Jerry -‐-‐ 1 1 1
Elaine 1 -‐-‐ 1 0
George 1 1 -‐-‐ 0
Kramer 1 0 0 -‐-‐
Each line represents a relationship between two actors
JerryElaine
George
Kramer
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SNA Demonstration (Kornbluh & Neal, in press)
Promoting Academic Success Project (PAS)
– Intervention Goals • To increase academic
achievement among minority boys
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SNA Demonstration (Kornbluh & Neal, in press)
Promoting Academic Success Project (PAS)
– Intervention Goals • To increase academic
achievement among minority boys
• “Lead teachers” selected by principals to encourage attendance at PD sessions and intervention use
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SNA Demonstration (Kornbluh & Neal, in press)
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System – An elementary school
implementing PAS
SNA Demonstration (Kornbluh & Neal, in press)
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System – An elementary school
implementing PAS Actors
– All regular and special ed teachers
SNA Demonstration (Kornbluh & Neal, in press)
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System – An elementary school
implementing PAS Actors
– All regular and special ed teachers
Relationships
– Advice on (a) family involvement, (b) behavior management, (c) instruction, & (d) promoting positive relationships.
Behavior management advice
SNA Demonstration (Kornbluh & Neal, in press)
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Data Collection – 10 to 15 minute structured interviews
SNA Demonstration (Kornbluh & Neal, in press)
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Questions that SNA can help answer:
– What are the implications of teachers’ existing advice networks for the spread of PAS strategies? – Are the lead teachers optimally situated in the network to be able to spread PAS strategies?
SNA Demonstration (Kornbluh & Neal, in press)
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Questions that SNA can help answer:
– What are the implications of teachers’ existing advice networks for the spread of PAS strategies? – Are the lead teachers optimally situated in the network to be able to spread PAS strategies?
SNA Demonstration (Kornbluh & Neal, in press)
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Multiplexity – Do actors share multiple types of ties?
– In this study: Do teachers tend to go to the same peers for different types of advice?
SNA Demonstration (Kornbluh & Neal, in press)
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Multiplexity
Advice Relationship 1. 2. 3. 4.
1. Instruction −−
2. Family .33 −−
3. Positive Relationships .42 .33 −−
4. Behavior .39 .32 .39 −−
Teachers tend to get advice from different people depending on the type of information they are seeking
Only 32% of relationships present in the behavior management network were also present in the involving families network
SNA Demonstration (Kornbluh & Neal, in press)
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Multiplexity
Advice Relationship 1. 2. 3. 4.
1. Instruction −−
2. Family .33 −−
3. Positive Relationships .42 .33 −−
4. Behavior .39 .32 .39 −−
Implication: May need “specialized” lead teachers based on content of advice
Only 32% of relationships present in the behavior management network were also present in the involving families network
SNA Demonstration (Kornbluh & Neal, in press)
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Questions that SNA can help answer:
– What are the implications of teachers’ existing advice networks for the spread of PAS strategies? – Are the lead teachers optimally situated in the network to be able to spread PAS strategies?
SNA Demonstration (Kornbluh & Neal, in press)
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Centrality – How many relationships does an actor have in a network?
– For directed networks: • Indegree-How many ties does an actor receive? • Outdegree-How many ties does an actor send?
– Normed as a percentage of all possible ties in the network
SNA Demonstration (Kornbluh & Neal, in press)
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Centrality – How many relationships does an actor have in a network?
– For directed networks: • Indegree-How many ties does an actor receive? • Outdegree-How many ties does an actor send?
– Normed as a percentage of all possible ties in the network
SNA Demonstration (Kornbluh & Neal, in press)
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Lead teachers 4 & 8: Gave advice to 10.53% of peers & 5.26% of peers
SNA Demonstration (Kornbluh & Neal, in press)
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Lead teachers 4 & 8: Gave advice to 10.53% of peers & 5.26% of peers
SNA Demonstration (Kornbluh & Neal, in press)
Alternate teachers 20 & 26 gave advice to 21.05% and 42.11% of their colleagues
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Bottom Line:
The principal’s selected lead teachers may not be the ideal lead teachers for spreading info about PAS
SNA Demonstration (Kornbluh & Neal, in press)
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SNA Demonstration (Kornbluh & Neal, in press)
SNA can provide a “birds eye” view of social systems
– This view eludes individual community members or leaders
– Can be used an alternative method for identifying leaders/key informants in a setting
– Can help identify how relational structure might facilitate or hinder communication
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Exercise
Think of a social network that you might be interested in exploring in your own work.
Who are the actors? - Are they people or organizations? - How would you set the boundaries of your network?
What relationships would you explore? - What scale of measurement is most appropriate? - Are the relationships symmetric or directional?
How would you collect the data?
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Questions?
Jennifer Watling Neal [email protected]
Analysis for the SNA demo is described in:
– Kornbluh, M. & Neal, J.W. (in press). Social network analysis. In L.A. Jason & D.S. Glenwick (Eds.), Handbook of Methodological Approaches to Community-Based Research. New York: Oxford University Press.