Philip Leifeld

@leifeld

Professor of Social Statistics, Dept of Social Statistics, University of Manchester Mitchell Centre for Social Network Analysis • Cathie Marsh Institute

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Philip Leifeld@leifeld· 6d

Philip Leifeld@leifeld· 6d

New #AJPS paper 🚨: "Endogenous Coalition Formation in Policy Debates." doi.org/10.7910/DVN/.... Statistical modelling and forecasting of discourse networks, based on the policy learning strategies of actors. 12 years from first analysis to publication! 😅 #policy #polisky #SNA @ajpseditor.bsky.social

Philip Leifeld@leifeld· 10d

Professor em. Frank Schweitzer (ETH Zurich, Chair of Systems Design @ethz.ch), giving the keynote speech on #resilience (through a #ComplexSystems lens) at the Political #Networks Conference 2026 @socialstats.bsky.social @manchester.ac.uk. Participants' minds were blown!

Early warning signals predict project collapse.

I introduce the keynote speaker with an intro slide.

Philip Leifeld@leifeld· 10d

Jungbae An (Ohio State University) receiving the Best Poster Prize at the Political Networks Conference 2026 @manchester.ac.uk, announced with a laudatio by Professor Jennifer Victor (George Mason University) during the mentoring lunch. Big congratulations, Jungbae! And thanks to the committee.

Philip Leifeld@leifeld· 10d

Political Networks Conference 2026 @manchester.ac.uk. My welcome address to the 114 participants, showing some key figures about the conference before introducing the keynote speaker. Check out the fantastic programme with abstracts for the 96 (!) presentations: sites.google.com/view/confpol...

Philip Leifeld@leifeld· 10d

Political Networks Conference 2026 at the University of Manchester @uomsoss.bsky.social. Professor Adam D. Henry (University of Arizona) leading a featured session on "Network Analysis as a Measurement Tool for Policy Process Research". Learning from leaders in the field! #publicpolicy #policy #SNA

Adam Henry calling me out for taking a photo because he is recording the session anyway

Philip Leifeld@leifeld· 10d

19th Political Networks Conference 2026 at Manchester @manchester.ac.uk, 4-7 August. Packed featured session on "Publishing on political networks" with Aisha Bradshaw (Nature Human Behaviour) and Martin Everett (Network Science) in the beautiful Boardroom of Oddfellows Hall. Audience on fire 🔥

Philip Leifeld@leifeld· 12d

Political Networks Conference 2026 @uomsoss.bsky.social. Dr. Laurence Brandenberger (U Zurich) teaching participants how to store complex political data in a graph DB and query the data effectively -- with everyone in the room actively contemplating doing the same with their own data. #POLNET2026

Dr. Laurence Brandenberger pointing at her slides.

Dr. Laurence Brandenberger addressing the audience with reference to the network shown on her slides.

Philip Leifeld@leifeld· 12d

Political Networks Conference 2026 @manchester.ac.uk @socialstats.bsky.social. Professor Joris Mulder introducing relational event models and Bayes factors for nested and ordered hypotheses in network models in his workshops. Showcasing marvellous software implementations and polisci examples. #sna

Professor Joris Mulder lecturing in front of a whiteboard with diagrams and equations and next to his slides projected onto the wall.

Professor Joris Mulder explaining diagnostic plots to the audience.

Philip Leifeld@leifeld· 12d

Political Networks Conference 2026 @manchester.ac.uk. Dr. Silviya Nitsova @uompols.bsky.social discussing the promises and pitfalls of designing different ways of collecting network data. The workshop audience is buzzing with questions. #sna #networkanalysis #politicalnetworks #PoliSky #polisci

Dr. Silviya Nitsova lecturing about surveyss and sampling in the context of network data collection, with slides in the background and participants in the foreground.

Dr. Alexandra Sadler, one of the participants, asking a question.

Philip Leifeld@leifeld· 13d

Political Networks Conference 2026 at Manchester @uomsoss.bsky.social. Dr. Lorien Jasny (University of Exeter) giving a workshop on Exponential Random Graph Models #ergm using R to our audience. #PoliSky #statnet #SNA #NetworkScience. So many good questions and happy faces all around!

Dr. Lorien Jasny presenting on ERGMs using R.

Philip Leifeld@leifeld· 13d

Political Networks Conference 2026 @manchester.ac.uk. Professor Ingo Scholtes showing animated simulations of random walk diffusion on time-preserving vs temporally shuffled networks in his workshop on Causality-Aware Temporal Networks, in a packed room #NetworkScience #SNA #NetworkAnalysis #PoliSky

Professor Ingo Scholtes pointing at the screen, where two identical networks are shown, with a large audience.

Professor Ingo Scholtes pointing at the screen, where two networks are shown, one with time-preserving paths and one with permuted edge sequences, with a large audience.

Philip Leifeld@leifeld· 22d

Discourse Network Analyzer 3.1.2 released: github.com/leifeld-lab/.... New functions: CSV importer, keyboard shortcuts. Lots of bug fixes, including statement type editor and using document-level variables in network export.

Philip Leifeld@leifeld· Jul 18

Check out the full programme with abstracts for the Political Networks Conference at Manchester in a couple of weeks: sites.google.com/view/confpol.... Exciting line-up with 90 presentations across 28 panel sessions in 4 parallel tracks! Registration has closed, but perhaps of interest.

Philip Leifeld@leifeld· Jun 22

Political Networks Conference 2026, University of Manchester (4–7 Aug), open for registrations until 6 Jul 2026 midnight: sites.google.com/view/confpol.... First come, first served. Subsidised workshops and registration. #sna #networkanalysis #polisky #publicpolicy #netsci #polisci @manchester.ac.uk

Philip Leifeld@leifeld· Jun 15

Discourse Network Analyzer 3.1.0 released: github.com/leifeld-lab/.... Annotate actor-concept statements in documents and export networks. Updated document and statement management from the associated R package rDNA, polarisation, phase detection, backbone identification, IRT scaling, and bug fixes.

Philip Leifeld@leifeld· Jun 1

New paper 🚨: "Disentangling Social Contagion from Prior Similarity in Time-Ordered Behaviour Sequences" with Sebastián Martínez and Laurence Brandenberger in #JRSSA: Journal of the Royal Statistical Society, Series A (doi.org/10.1093/jrss...). #networkanalysis #polisky #SNA @jrssa.bsky.social

Philip Leifeld@leifeld· May 29

New paper 🚨: "Fully Bayesian Estimation of Temporal Decay in Ordinal Relational Event Models" with Jackie Siaw Tze Wong in #CSDA: Computational Statistics and Data Analysis (doi.org/10.1016/j.cs...). #relevent #sna #networkscience #bayesian #rem #temporalnetworks #computational #statistics

Philip Leifeld@leifeld· May 29

New paper 🚨: "Measuring Frame Evolution: Smoothed Temporal Framing Trajectories in Complex Policy Debates" with Kristijan Garic in #JCMS Journal of Common Market Studies (doi.org/10.1111/jcms...). #policystudies #networkanalysis #framing #polisky #sna #publicpolicy #policydebate #networkscience

Philip Leifeld@leifeld· Mar 9

Call for papers: 19th Annual Political Networks Conference, University of Manchester, 4–7 Aug 2026. sites.google.com/view/confpol... Paper and poster submissions now open (deadline: 12 April). First time in Europe. Training workshops. #NetworkAnalysis #Polisky #publicpolicy #netsci #NetworkScience

University of Manchester main building from Oxford Road

University of Manchester main building quadrangle with ivy on main building

Manchester, England photographed after sunset from the Beetham Tower

Philip Leifeld@leifeld· Feb 10

Inferential Network Analysis: attend my MethodsNet Summer School 2026 course in Vienna 6 - 10 July. Early-bird registration until 25 Feb, normal registration until 20 Apr 2026. Will cover #ERGM, #TERGM, #SAOM, #REM, LSM, #QAP, CUG, LOLOG, NAM. #SNA #NetworkScience #NetworkAnalysis #PhDTraining

Philip Leifeld@leifeld· Feb 10

Discourse Network Analysis: attend my MethodsNet Summer School 2026 course in Vienna 29 June - 3 July. Early-bird registration until 25 Feb, normal registration until 20 Apr 2026. Will cover software, annotation, DNA methods, inference, theory. #SNA #PublicPolicy #Polisky #Discourse #NetworkAnalysis

Philip Leifeld@leifeld· Dec 18

New publication in Social Network Analysis and Mining with Yuanyuan Shang. 🚀 #SNA Coming out of a collaboration with #BlackRock, the asset management firm. Paper title: Applying a Panel Network Formation Model to Limited Partnership Matching in the Private Capital Market. doi.org/10.1007/s132...

Separate investment networks between General Partners (GP) and Limited Partners (LP) for five different asset classes (private equity, private debt, real estate, natural resources, and infrastructure) and one combined ("hybrid") network. Each of the six networks has thousands of nodes and a typical Fruchterman-Reingold network layout.

Philip Leifeld@leifeld· Sep 18

In this new paper with @fisherdanar.bsky.social in Politics and Governance, we distinguish intrinsic and instrumental polarisation and analyse polarisation curves and phases in US climate politics. We also present new methods for discourse networks. doi.org/10.17645/pag... @cogitatiopag.bsky.social

Polarisation curve for the US Congress between 2011 and 2016, peaking around the release of the Clean Power Plan in the summer of 2015.

Philip Leifeld@leifeld· Jun 9

New article published: "A Three‐Stage Model of the Maturation of Nascent #Policy #Subsystems toward Stable #Advocacy Coalitions, with Evidence From the UK's Response to #COVID‐19", with Kristijan Garic in the Policy Studies Journal: doi.org/10.1111/psj.... #SNA #Discourse #ACF @psjeditor.bsky.social

Three stages with ideal-type network structures. The first stage shows two separate clusters of solution-oriented actors and actors with vested interests. The second stage shows a disaggregation into multiple clusters of each kind. The third stage shows emerging advocacy coalitions as clusters cutting across the two types of actors.

A discourse network diagram with nodes and edges, corresponding to the first stage of the theory, with several clusters.

A discourse network diagram with nodes and edges, corresponding to the second stage of the theory, with more clusters than before, in COVID-19 policy making in the UK.

Philip Leifeld@leifeld· Jun 3

More network analysis training available for external participants here at the Mitchell Centre, University of Manchester. In-person courses in Manchester 15-26 September 2025; registration deadline 30 June. www.socialsciences.manchester.ac.uk/mitchell-cen... #socialscience #sna @uomsoss.bsky.social

Philip Leifeld@leifeld· May 3

"Inferential Network Analysis" @methodsnet.bsky.social Summer School in Vienna is scheduled for 14-18 July. Details: methodsnet.org/course/d02-0.... Will cover ERGM, TERGM, REM, LSM, AMEN, QAP, SAOM, LOLOG, NAM; with stat theory, examples, R labs, student presentations. Registration deadline: 13 May

Six simulated networks with different coefficients as an illustration.

Boxplots of distributions of four network statistics in simulated networks versus red curves showing the distributions for the observed network, as an illustration of goodness-of-fit assessment.

An empirical co-authorship network as an illustration.

Philip Leifeld@leifeld· Mar 19

Jürgen Lerner (University of Konstanz) presenting on relational hyperevent models applied to citation and co-authorship networks in our Mitchell Centre for Social Network Analysis at the University of Manchester. Great stuff! @mitchellsna.bsky.social #networks #SNA #NetworkScience #NetworkAnalysis

Philip Leifeld@leifeld· Mar 11

New article published: "When does discursive change happen? Detecting phase transitions in discourse networks of sustainability transitions" with Kimberley Vandenhole and Kristijan Garic in Energy Research & Social Science: doi.org/10.1016/j.er.... #SNA #STS #SustainabilityTransitions #discourse

Three types of discourse networks: Affiliation network, actor network, and concept network.

Incrementally changing networks along temporally overlapping moving time windows.

Multidimensional scaling (temporal embedding) of the structural trajectory of the discourse network, heatmap, state dynamics, and cluster silhouette plot for the low-emission zone discourse in Ghent.

Actor networks corresponding to the six identified phases in the empirical case study.

Philip Leifeld@leifeld· Feb 21

Arena effects in climate politics: We fit an item response model to US climate elites with the same items/beliefs across 3 data sources/arenas and examine how the arena you speak in moves your ideological position to left or right doi.org/10.1177/2053... #PoliSky #ideology #polbehavior #publicpolicy