Data Mining HUDK4050 Fall 2014 Assignment B5 Connections I got a lot of questions on the homework when 12345 posts 12 times in response to 24601 Is this 12 connections Connections I got a lot of questions on the homework when 12345 posts 12 times in response to 24601 ID: 634284
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Slide1
Core Methods in Educational Data Mining
HUDK4050
Fall 2014Slide2
Assignment B5Slide3
Connections
I got a lot of questions on the homework, when 12345 posts 12 times in response to 24601
Is this 12 connections?Slide4
Connections
I got a lot of questions on the homework, when 12345 posts 12 times in response to 24601
Is this 12 connections?
In Social Network Theory, it isn’t
It’s a connection with a strength of 12Slide5
What are other ways connection strength could be conceptualized, in an online course?Slide6
In the text, I described several types of nodes
In a graph of classroom interactions, there could be several different types of nodes
Teacher
TA
Student
Project Leader
Project ScribeSlide7
What could the node types be, in an online course?Slide8
In the text, I described several types of links
In a graph of classroom interactions, there could be several types of links
Leadership role (X leads Y)
Working on same learning resource
Helping act
Criticism act
Insult
Note that links can be directed or undirectedSlide9
What could the link types be, in an online course?Slide10
Four types of centrality
Degree
centrality
Closeness centrality
Betweeness
centrality
Eigenvector centralitySlide11
What does each one mean mathematically?
Degree
centrality
Closeness centrality
Betweeness
centrality
Eigenvector centralitySlide12
What does each one mean conceptually?
Degree
centrality
Closeness centrality
Betweeness
centrality
Eigenvector centralitySlide13
Questions or comments?Slide14
Network Analysis
The most common use of network analysis is for social networks
When else might it apply?Slide15
Network Analysis
Let’s make a list of networks we could model, beyond online course forumsSlide16
Let’s break into groups
Each group takes a type of network
One group per network type
Define what the meaning in this network would be (or could be) for
Node types, links, link types, link strength
Density
Reachability, Geodesic Distance, Flow
Centrality (in its four forms)
Other measures that might be particularly relevant for your type of networkSlide17
Now reconvene
Who wants to share
What their network type is
Node types, links, link types, link strength
Anything else that’s interestingSlide18
Other questions or comments?Slide19
An Example of Discovery with Models with Social Networks
Let’s watch together
https://www.youtube.com/watch?v=F2y-GFzhEqcSlide20
Questions? Comments?Slide21
Assignment B6
Correlation MiningSlide22
Next Class
No class MondaySlide23
Next Class
Wednesday, November 12
Baker, R.S. (2014) Big Data and Education. Ch. 5, V1, V2.
Arroyo, I., Woolf, B. (2005) Inferring learning and attitudes from a Bayesian Network of log file data. Proceedings of the 12th International Conference on Artificial Intelligence in Education, 33-40
.
Rai, D., Beck, J.E. (2011) Exploring user data from a game-like math tutor: a case study in causal modeling. Proceedings of the 4th International Conference on Educational Data Mining, 307-313
.
Rau, M. A., &
Scheines
, R. (2012) Searching for Variables and Models to Investigate Mediators of Learning from Multiple Representations. Proceedings of the 5th International Conference on Educational Data Mining, 110-117.Slide24
The End