**Complex** systems are ones with **a large effective number of strongly-interdependent variables.**

This excludes both low-dimensional systems, and high-dimensional ones where the variables are either independent, or so strongly coupled that only a few variables effectively determine all the rest.

Cosma Rohilla Shalizi

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Tags: 4-D, complex systems, complexity, Cosma Rohilla Shalizi, econometrics, explanatory variable, general systems theory, heroes, interaction terms, interdependent, math, mathematics, maths, nlin, nonlinear dynamics, OLS regression, phenomenon, statistics, systems theory

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