The Siena webpage
Posted by Armando Brito Mendes | Filed under ARS - SNA, software
SIENA is a program for the statistical analysis of network data, with the focus on social networks.
Networks here are understood as entire (complete) networks, not as personal (egocentered) networks: it is assumed that a set of nodes (social actors) is given, and all ties (links) between these nodes are known – except perhaps for a moderate amount of missing data.
SIENA is designed for analyzing various types of data as dependent variables:
- Longitudinal network data:
- This refers to repeated measures of networks on a given node set (although it is allowed that there are some changes in the node set). Models can be specified with actor-oriented as well as tie-oriented dynamics.
- Longitudinal data of networks and behavior:
- This is like longitudinal network data, but in addition there are one or more changing nodal variables that are also treated as dependent variables, and referred to as behavior. The network will influence the dynamics of the behavior, and the behavior will influence the dynamics of the network. In other words, this is about the co-evolution of networks and behavior.
- Cross-sectional network data.
- ‘Cross-sectional’ means that only one observation is available. This method uses exponential random graph models (‘ERGMs’), also called p* models.
The ERG model is implemented in SIENA version 3, but not any more in version 4 (RSiena).
The name SIENA stands for Simulation Investigation for Empirical Network Analysis.
Tags: ARS\SNA intro, R-software
Ruth Ripley’s SNA Page
Posted by Armando Brito Mendes | Filed under ARS - SNA, materiais ensino
I teach two courses on programming in R. Slides etc for the (shared) lectures are here and extra resources for the M.Sc course are here.
My 1998 D.Phil. thesis, Neural Network Models for Breast Cancer Prognosis, is available for downloading in PDF (2.7mb) or 2-up PostScript (680kb).
S-PLUS survival analysis software (similar to that used in the thesis) is available for Unix and Windows. (Previous versions of the software are available for S-PLUS 3.4 and S-PLUS 2000.)
Slides from a seminar entitled Neural network based non-linear survival methods with applications to breast cancer prognosis are available for download as 4-up Postscript (zipped) (75kb)
Software for analysis of western medieval chant melodies, created in collaboration with the Oxchant Group in the Faculty of Music, is available here. A paper describing the work is available here.
A complete list of publications is available here.
Tags: ARS\SNA intro, R-software
Stanford Large Network Dataset Collection
Posted by Armando Brito Mendes | Filed under ARS - SNA, data sets
Bom site com dados para ARS
- Social networks: online social networks, edges represent interactions between people
- Communication networks: email communication networks with edges representing communication
- Citation networks: nodes represent papers, edges represent citations
- Collaboration networks: nodes represent scientists, edges represent collaborations (co-authoring a paper)
- Web graphs: nodes represent webpages and edges are hyperlinks
- Amazon networks : nodes represent products and edges link commonly co-purchased products
- Internet networks : nodes represent computers and edges communication
- Road networks : nodes represent intersections and edges roads connecting the intersections
- Autonomous systems : graphs of the internet
- Signed networks : networks with positive and negative edges (friend/foe, trust/distrust)
- Wikipedia networks and metadata : Talk, editing and voting data from Wikipedia
- Twitter and Memetracker : Memetracker phrases, links and 467 million Tweets
Tags: análise de dados, ARS\SNA intro, grafos
Mapping Breivik’s Mind
Posted by Armando Brito Mendes | Filed under ARS - SNA, visualização
Uma boa aplicação do mapeamento de textos em redes...
The man behind the Norway bombings and shootings wrote a link-filled manifesto. To show the vast spread of websites he cites, and how they linked to each other, we turned to French visualisers Linkfluence
Tags: ARS\SNA intro, captura de conhecimento, grafos
What is Social Network Analysis?
Posted by Armando Brito Mendes | Filed under ARS - SNA
Uma boa definição de redes sociais
Network analysis is based on the intuitive notion that these patterns are important features of the lives of the individuals who display them. Network analysts believe that how an individual lives depends in large part on how that individual is tied into the larger web of social connections. Many believe, moreover, that the success or failure of societies and organizations often depends on the patterning of their internal structure.
Tags: ARS\SNA intro, definição, grafos
As redes podem explodir
Posted by Armando Brito Mendes | Filed under ARS - SNA, visualização
Scientists from the Max Planck Institute for Dynamics and Self-Organization discover how the size of networks can skyrocket
A single new connection can dramatically enhance the size of a network – no matter whether this connection represents an additional link in the Internet, a new acquaintance within a circle of friends or a connection between two nerve cells in the brain.
novas ligações fazem explodir a dimensão das redes
Tags: ARS\SNA intro
NodeXL: Suplemento do Excel openSource para SNA
Posted by Armando Brito Mendes | Filed under ARS - SNA, visualização
Add-in do Excel para Análise de Redes Sociais (SNA)
Do you need to display and analyze a network graph but you don’t want to deal with difficult applications, arcane file formats, or advanced programming languages? NodeXL may be what you’re looking for.
Tags: ARS\SNA intro, grafos
