background preloader

Clustering coefficient

Clustering coefficient
In graph theory, a clustering coefficient is a measure of the degree to which nodes in a graph tend to cluster together. Evidence suggests that in most real-world networks, and in particular social networks, nodes tend to create tightly knit groups characterised by a relatively high density of ties; this likelihood tends to be greater than the average probability of a tie randomly established between two nodes (Holland and Leinhardt, 1971;[1] Watts and Strogatz, 1998[2]). Two versions of this measure exist: the global and the local. The global version was designed to give an overall indication of the clustering in the network, whereas the local gives an indication of the embeddedness of single nodes. Global clustering coefficient[edit] The global clustering coefficient is based on triplets of nodes. Watts and Strogatz defined the clustering coefficient as follows, "Suppose that a vertex has neighbours; then at most edges can exist between them (this occurs when every neighbour of ). over all Related:  SNAentreprise sociale

Visualising Twitter Friend Connections Using Gephi: An Example Using the @WiredUK Friends Network To corrupt a well known saying, “cook a man a meal and he’ll eat it; teach a man a recipe, and maybe he’ll cook for you…”, I thought it was probably about time I posted the recipe I’ve been using for laying out Twitter friends networks using Gephi, not least because I’ve been generating quite a few network files for folk lately, giving them copies, and then not having a tutorial to point them to. So here’s that tutorial… The starting point is actually quite a long way down the “how did you that?” Here’s what we’ll be working towards: a diagram that shows how the people on Twitter that @wiredUK follows follow each other: The tool we’re going to use to layout this graph from a data file is a free, extensible, open source, cross platform Java based tool called Gephi. From the Gephi file menu, Open the appropriate graph file: Import the file as a Directed Graph: The Graph window displays the graph in a raw form: Sometimes a graph may contain nodes that are not connected to any other nodes.

2014 Global Social Impact House — Social Impact House How to apply Student enrolled in the Social Entrepreneurship Course on Coursera can apply by completing this form by October 24, 2014. Finalists will be notified on October 28, 2014. Finalists are selected based on the following criteria: Clarity of their social impact idea; Proven entrepreneurial experience and ability to implement ideas; A clear sense of what skills and resources they currently need to advance their social ventures;A strong Interest in collaborating with other global social entrepreneurs;Passion for making a social impact. Lodging and program are covered by The Center for Social Impact Strategy. For all questions or inquiries, email Cosmo Fujiyama at Functional brain network efficiency predicts ... [Hum Brain Mapp. 2012

Four Ways of Looking at Twitter - Scott Berinato - Research by Scott Berinato | 2:55 PM February 18, 2010 Data visualization is cool. It’s also becoming ever more useful, as the vibrant online community of data visualizers (programmers, designers, artists, and statisticians — sometimes all in one person) grows and the tools to execute their visions improve. Jeff Clark is part of this community. Clark’s latest work shows much promise. “Twitter is an obvious data source for lots of text information,” says Clark. His tools are definitely early stages, but even now, it’s easy to imagine where they could be taken. Take TwitterVenn. Right away I see Apple tweets are dominating, not surprisingly. I was shocked at the relative infrequency of “google” tweets. So then I went to Twitter Spectrum, a similar tool that compares two search terms and shows which words are most commonly associated with each term and which words are most commonly used in tweets with both terms. I love that the word “ugh” is dead center between Google and Microsoft.

LINC Lab : Learning & Innovation in Networks & Communities - Grenoble Ecole de Management Mission Etudier la manière dont les institutions privées et publiques peuvent puiser au cœur de leurs réseaux et de leurs communautés pour créer du savoir et innover. Pour mener ses travaux de recherche, l'Institut LINC Lab analyse l'impact des communautés et des réseaux sur l'innovation des organisations à travers : leur région d'origine (Europe, USA, Chine) la forme de la structure la culture les secteurs d'activité et les types de projets les nouvelles formes d'organisations ou de réseaux qui émergent Directeur Pr. Dimitris est professeur à Grenoble Ecole de Management, spécialisé dans les systèmes d'information et le management de la technologie. Dimitris est titulaire d'une HDR en sciences économiques de l'Université Pierre Mendès France de Grenoble, d'un doctorat en architecture (Département Ville et aménagement du territoire) de l'Université de Sheffield, en Angleterre, et un diplôme en génie civil de l'Université de Patras, en Grèce. Recherche et Publications

Top 10 Ways to Make Yourself Look (and Be) Smarter How terribly obnoxious of you. Thanks for sharing. Well, it is probably not the smartest move ever to call monolingual people dumb. People in Europe need only travel a few hours to encounter another language, and bi- and tri-linguality is essential to business and communication there. Also, way to be a dick. Yes, I realize that's the norm in Europe, where there's an international border every 50 miles. LH is an American-run site, with a largely American audience and authors who (I believe) are all American, so let's not pretend like suddenly the cultural norms around here are based on what happens in Europe or Canada.

Understanding Google Analytics: A Simple Guide to Advanced Terms 811 Flares Twitter 449 Facebook 114 Google+ 62 LinkedIn 84 inShare84 Buffer 102 811 Flares × Google analytics is an amazing free tool that is often under utilized. Are you aware of it’s full potential? You certainly don’t need to pay for a web analytics tool unless you are using Google analytics to it’s maximum. In this article we outline some of the confusing/advanced terms in Google analytics. Engagement Rate Standard reports -> Audience -> Behavior -> Engagement Engagement shows how long a person is on your website. You ideally want people to engage in pages other than your blog! So don’t be too concerned! Bounce Rate – Beyond the basics If someone comes into your site and leaves without going anywhere else, or is inactive on that page for more than 30 minutes, it’s considered a bounce. a). Audience -> Behavior -> New Versus Returning b). Content -> site content -> all pages c). Custom Dashboards Creating custom dashboards is quite straight forward. Event Tracking This breaks down as follows:

Bridging the Missing Middle: The Impact of Larger Loans on Kiva Today, Kiva entrepreneurs around the world are making fundamental changes in their own lives and the lives of their families -- from a Ugandan farmer looking to buy seeds and tools for increasing crop yields, to a talented seamstress hoping to start a business with a new sewing machine. But some entrepreneurs still face difficulties accessing the capital they need to create jobs and address larger, community-wide issues of poverty. In industrialized nations, these small and medium enterprises (5 - 250 employees) are responsible for 75% of the workforce and 95% of the companies, yet in emerging markets they’re practically non-existent. This lack of small and medium enterprises in less developed countries, an essential part of strong economies, is what's known as the Missing Middle. When an extensive World Bank study asked people living in poverty what they most need, jobs were one of the top answers not being addressed. The Missing Middle Community-Wide Impact

Exercise: Fitter Kids Make Better Grades, Study Says | SmartyPants Vitamins Yep. Curls in the gym might give you accolades in school. That’s right, exercise may boost your grades. A recent study of more than 1200 middle school students in Texas noted that both boys and girls that had higher levels of heart and lung health had better scores and grades on both math and reading tests. After controlling for self-esteem and income status, researchers measured students’ levels of heart and lung health and body mass index. Becky Hashim, a clinical psycholgist and assistant professor in the department of psychiatry and pediatrics at the Children’s Hospital of Montefiore in New York City notes, “It’s hard to tease apart the exact reason for this association. Inactivity can kill by encouraging lifestyle-related illnesses like diabetes and heart disease. Of note is that for the boys, higher reading scores occurred when they had more social support. Comments

Social Network Analysis: making invisible work visible. Everyone is talking about the enormous benefits to be had through collaborative working and better employee engagement. Industry analysts report a 25% improvement in organisational efficiency when companies successfully deploy a collaboration platform. Whether it’s social media or social collaboration, organisations are striving to deliver better value through a more connected workforce and closer engagement with customers and stakeholders. While companies know that social networks are important, most managers don’t understand how these networks really work. Managers may implement collaborative technologies with the vague notion that they will help employees interact more seamlessly and that this will improve the quality of their work. Sometimes these initiatives have the desired effect, but the results are not always positive. What else can network analysis reveal? Find out how Social Network Analysis (SNA) can make the ‘invisible work, visible’ (see attached PDF).

Early stage impact investing: a call for action By Anais Mangin – SEED, hosted by adelphi research ( The exponential growth of small, micro and medium enterprises (SMMEs) in Africa, Asia and Latin America has contributed significantly to the burgeoning green economy. Every year more and more small and green entrepreneurs are creating innovative ways to produce sustainable products and services that are having wide-reaching social and economic impacts on the world’s poorest communities.In many cases, reducing poverty is the sole driver of these enterprises; in others, it’s creating green solutions to waste, energy or climate change issues. In 2010, the World Economic Forum highlighted the problem by launching its ‘Missing Middle Initiative’, to try to find ways to resolve the problem. Therein, according to the SEED analysis, lies the problem. So it seems there are still many variables and uncertainties related to impact investments, and therefore the barriers facing SMMEs are far from being ameliorated.

the race/intelligence/IQ debate December 1997 Claims that "Blacks" are dumber than "Whites", a la The Bell Curve, crop up every so often on anthro-l. In a way I'm responsible for the latest outbreak, since it began when I posted a review of Jared Diamond's Guns, Germs and Steel. In order to save time and energy next time this comes around, and to provide a resource for people interested in the issue, I am collecting what I consider to be the most interesting contributions. My own biases should be obvious. Index J. J. (an extract from a much longer review) Although independent researchers have repeatedly confirmed: (1) The geographical distribution of intelligence, (2), the relationship between intelligence and brain size, (3), the geographical distribution of brain size, and (4), the heritability of intelligence, Diamond, the author of The Rise and Fall of the Third Chimpanzee, is like a composite of the three wise monkeys and does not want to see, hear, or say anything about these topics. 1. 2. 3. 4. Liz Snyder D. Dr.

Optimice - Optimising Business Relationships La microfinance dans le monde Le microcrédit, un principe économique expérimenté dans les pays en voie de développement avant d'essaimer à travers le monde Le microcrédit a fait son apparition dans les années 70 au Bangladesh avec la création de la Grameen Bank par le professeur Muhammad Yunus, Prix Nobel de la Paix 2006, qui souhaitait permettre aux femmes pauvres de son pays de développer de petites activités économiques. La méthode sera ensuite exportée en Guinée et au Burkina Faso, puis transposée en France et en Europe par Maria Nowak, fondatrice de l’Adie. Le succès de ce nouveau modèle économique, qui propose aux personnes situées en "bas de la pyramide sociale" de créer leur propre emploi, ne s’est pas démenti depuis. Le microcrédit a essaimé dans d’autres pays d’Europe sous l’impulsion de l’Adie, et a diversifié ses applications : outre le microcrédit professionnel, les micro-entrepreneurs se voient désormais proposer des microcrédits personnels pour l’emploi ainsi que des micro-assurances. Perspectives