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Random mixing of people is a convenient assumption, but often unrealistic. Time to revisit the good old Greenberg Index?

@Marco_Civico shows how the N-GDI drops that assumption and measures linguistic diversity in actual contacts

🎥youtu.be/iVDwku5zO6Y
#JASSS #NetworkScience

Your society may look highly multilingual on paper, but who actually talks to whom? The N-GDI measures diversity in social ties, not just in population demographics, and shows how far the two can drift apart.

Read the full #OpenAccess article in #JASSS: jasss.org/29/4/1.html

📢 #JASSS Vol. 29, Issue 4 is out!

11 articles on opinion dynamics, intergroup contact, religion, labour markets, altruism & more, plus fresh methods for #ABM testing & inference.

Dive into the issue and share your thoughts 👉 jasss.org/29/4/contents.…

New contribution: "Theory is Two-Faced and this can be a problem for modellers" by Bruce Edmonds. #abm #theory #inference #modelling #socialsimulation #simulation #RofASSS @BruceEdmonds rofasss.org/2026/10/21/the…

Pure #SequentialSampling clusters where it shouldn't, and requires endless simulation runs. A new #ABM study shows that #MixedAdaptiveSampling can fix this, reducing costs while enhancing output interpretation.

Read the full #OpenAccess article in #JASSS: jasss.org/29/3/6.html

Calibrating complex agent-based models shouldn't mean settling for a single "best guess" parameter set.

Kejian Li presents a new HPC-ABC-SMC framework that cuts #ABM calibration time by 42x while capturing complete parameter uncertainty.

Watch here👉 youtu.be/SQ8hzmVj2gQ

Single-point estimates are not enough for complex #ABM calibration. A new framework delivers full #BayesianComputation posterior distributions with a 42-fold efficiency gain, applied to a global #FoodTrade model.

Read the full #OA article in #JASSS: jasss.org/29/3/5.html

The same voting reform can polarize one democracy and moderate another. It comes down to system size.

Thomas Mustillo (@KeoughGlobalND, @KelloggInst) breaks down his new #JASSS paper on party competition under costly voting🎥youtu.be/lWkAIoc_hIE

Abstainers live at the extremes, not the centre. A new #ABM shows that voting costs reshape entire #PartySystem dynamics, driving #polarization in small party systems while eroding citizen representation in larger ones

Read the full #OA article in #JASSS: jasss.org/29/3/4.html

Why is it so hard to stop eating #UltraProcessedFoods? The simple truth is that dieting alone will not do it. A new #ABM study shows that only drastically reducing UPF availability can reverse learned food preferences.

Read the full #OA article in #JASSS: jasss.org/29/3/3.html

Where does inequality come from, before states, markets, or agriculture?

New #ABM reveals how stratification emerges in hunter-gatherer societies, driven by skill, luck, greed, and what a society chooses to reward.

Full #OpenAccess article in #JASSS 👉jasss.org/29/3/2.html

It looks like our editor @squazzoni took some days off. Don't expect prompt replies in the next couple of days!

System-level interventions can ignite cascades of change. They can also collapse under mis-targeting.

New #JASSS paper by @gaveltri models the tradeoff and proposes a portfolio approach to scale power without losing the safety net

Read #OpenAccess here: jasss.org/29/3/1.html

📢 #JASSS Issue 3 (Vol. 29) is out.

How does order, inequality, and change emerge from individual decisions? From behavioral policy to ancient societies to global trade — this issue explores it all through agent-based modeling.

Read here 👇
jasss.org/JASSS.html

🔎 Sneak peek from the forthcoming #JASSS issue:
#Nudge individuals, or reshape the systems around them? Wrong question.

@gaveltri shows it's a transformation–robustness tradeoff 👇
youtube.com/watch?v=4eY_Qb…
#ABM #BehavioralScience #PublicPolicy

Who is most at risk in aged care facilities, and when?

A new #ABM study builds institutional #ContactMatrices from staff shifts and care routines, revealing where #InfectiousDisease transmission truly concentrates.

Read the full #OA article in #JASSS: jasss.org/29/2/7.html

Not all nodes are equal — yet #Network models treat them as if they were. A new study adapts the Configuration Model to embed node attributes into #NetworkStructure, with a tenfold increase in #ClusteringCoefficient.

Read the full #OA article in #JASSS: jasss.org/29/2/6.html

More realistic #AgentBasedModels are not always better: a new study shows that richer agent #Heterogeneity undermines #ModelCalibration reliability — reopening the KISS vs KIDS debate on new empirical ground.

Read the full #OpenAccess article in #JASSS: jasss.org/29/2/5.html

No protests in the streets — yet resistance grows.

A new #ABM study models how #OnlineProtest dynamics on #SocialMedia quietly accumulate dissent potential among ordinary users even under #AuthoritarianRepression.

Read the full #OA article in #JASSS: jasss.org/29/2/4.html

Bad news travels fast — but how exactly?
A new #ABM study combines #DeepLearning sentiment tracking and an epidemiological model to map how negativity about corporations spreads across Reddit's #FinancialCommunities.

Read the full #OA article in #JASSS: jasss.org/29/2/3.html