Notes on “Quantitative research, agent-based modelling and theories of the social”, by Hedström and ˚Aberg, chapter 6 (pp. 114–144) in Hedström (2005). For 36-462. This chapter has both a theoretical/methodological aim, and an empirical one. The theoretical aim is to explain a non-trivial social phenomenon in what the authors regard as a methodologically sound way, to exemplify the virtue of the methodology. (In the book, this is what Hedström has spent the previous five chapters building up to.) The empirical aim is to study peer effects in youth unemployment. Let’s take the theory side first. The picture they have in mind is something like this: prediction Macro(t) −−−−−− → Macro(t + 1
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