We are looking for a person with good skills and experience in Natural Language Processing for our project on the boundary of history and social network analysis. The project involves analysis of historical documents and written communication (e.g. letters) in Portuguese. Skills/experience: Skills and experience in text mining ... [Read more...]

I have just published a small package lspline on CRAN that implements linear splines using convenient parametrisations such that coefficients are slopes of consecutive segments coefficients capture slope change at consecutive knots Knot locations can be specified manually (with lspline()) at breaks dividing the range of x into q equal-frequency ... [Read more...]

English summary: On 2016-09-28 I presented an application of methods of estimating Exponential-family Random Graph Models from ego-centrically sampled data. Conference was in Polish. See the program and my slides for further details. W zeszłym tygodniu (28-30.09.2016) miała miejsce konferencja Metodologiczne Inspiracje 2016. Badania ilościowe w naukach ... [Read more...]

I would like to (re)announce the workshop I will be giving on using R and ‘igraph’ for Social Network Analysis on the upcoming Sunbelt 2016 conference in Newport Beach. My goal is to provide gentle and practical tour through the SNA functionality of R package “igraph”. The exact date of ... [Read more...]

Summary in English: We are organizing a two-day workshop on network analysis in R. The dates are 2-3 of December, 2015. The workshop will be in Polish. For more information and registration see this page. Zapraszamy na szkolenie z analizy sieciowej w R w dniach 2-3 grudnia 2015. Analiza sieci społecznych (... [Read more...]

In data analysis it happens sometimes that it is neccesary to use weights. Contexts that come to mind include: Analysis of data from complex surveys, e.g. stratified samples. Sample inclusion probabilities might have been unequal and thus observations from different strata should have different weights. Application of propensity score ... [Read more...]

Parallel coordinates plot is one of the tools for visualizing multivariate data. Every observation in a dataset is represented with a polyline that crosses a set of parallel axes corresponding to variables in the dataset. You can create such plots in R using a function parcoord in package MASS. For ... [Read more...]

These are slides from the very first SER meeting – an R user group in Warsaw – that took place on February 27, 2014. I talked about various “lifehacking” tricks for R and focused how to use R with GNU make effectively. I will post some detailed examples in forthcoming posts. Oto moje slajdy ... [Read more...]

Yesterday I submitted a new version (marked 2.0-0) of package ‘intergraph’ to CRAN. There are some major changes and bug fixes. Here is a summary: The package supports “igraph” objects created with ‘igraph’ version 0.6-0 and newer (vertex indexing starting from 1, not 0) only! Main functions for converting network data between ... [Read more...]

R has a built-in collection of 657 colors that you can use in plotting functions by using color names. There are also various facilities to select color sequences more systematically: Color palettes and ramps available in packages RColorBrewer and colorRamps. R base functions colorRamp and colorRampPalette that you can use to ... [Read more...]

Dear readers, this blog is moving out from wordpress.com to a new location. The new address is http://bc.bojanorama.pl. Please update your bookmarks. Drodzy czytelnicy, blog “Brokering Closure” wyprowadza się z wordpress.com pod nowy adres: http://bc.bojanorama.pl. Zaktualizujcie swoje linki/zakładki. Filed under: ... [Read more...]

It turned out that I wrote the last post on “intergraph” package too hastily. After some feedback from CRAN maintainers and deliberation I decided to release the updated version of the “intergraph” package under the  original name (so no new package “intergraph0″) with version number 1.2. This version relies on legacy “... [Read more...]

On June 17 a new version (0.6) of package ”igraph” was released. This new version abandoned the old way of indexing graph vertices with consecutive numbers starting from 0. The new version now numbers the vertices starting from 1, which is more consistent with the general R convention of indexing vectors, matrices, etc. Because ... [Read more...]

I am currently in Redondo Beach, CA at the Sunbelt XXXII social networks conference. The program is thick from numerous interesting talks so the event promises to be very interesting. Today in the morning I gave the workshop “Introduction to Social Network Analysis with R”. Over 50 people registered. I am ... [Read more...]

I just released the first official version of the ‘intergraph’ R package. With the functions provided in the current version (1.1-0) you can convert network data objects between classes ‘igraph’ and ‘network’. The package supports directed and undirected networks, and handles the node, tie, and network (graph) attributes. Mutliplex networks (... [Read more...]

Elijah asked the following via SOCNET mailing list: I was wondering if anyone knew of a script or tool which would give me the network distance of nodes to a particular class of nodes.  I think of this as an Erdos number, except instead of getting the distance to one ... [Read more...]

                      If you think that R is The EnvironmentForStatisticalAnalysisAndGraphics but you do not think that Vim is The Editor for text files you might want to have a look at R Studio. It works on Windows, MacOS and Linux. I tried it out on my Ubuntu [...] [Read more...]

For all those who think that Vim is The Editor for text files, and simultaneously think that R is The EnvironmentForStatisticalAnalysisAndGraphics. After trying out various options for intergrating Vim with R I settled on the following configuration: Use Vim-R-pluginfor editing R code files, R documentation files (*.Rd) as well as ... [Read more...]

A short update on network+intergraph R packages story: Couple of days ago Carter Butts released a new version of the ‘network’ package (ver. 1.5-1). It has a namespace now. Consequently, the ‘intergraph’ package should work out-of-the-box. There is no need to install my hacked version of the ‘network’ package ... [Read more...]

The next Sunbelt Social Networks Conference (XXXI) will take place in February 2011 in St Pete Beach, Florida, USA. The preliminary program is available here. There is still time to submit abstracts (deadline is on October 29, 2010). At the conference I will be teaching the workshop “Introduction to Social Network Analysis with ... [Read more...]