Duration of agriculture and distance from the steppe predict the evolution of large-scale human societies in Afro-Eurasia

Humanities and Social Sciences Communications • Vol/Iss. 7(1) • Nature Portfolio • • Published In • Pages: 1-8 •
By Currie, Thomas E., Turchin, Peter, Turner, Edward, Gavrilets, Sergey

Hypothesis

Terrain ruggedness predicts greater imperial density.

Note

See Table 1 for Pearson's R and Spearman's ρ.

Test

Test NameSupportSignificanceCoefficientTail
Generalized Least Squares (GLS) regressionNot SupportedUNKNOWNr = 0.21UNKNOWN

Variables

Variable NameVariable Type OCM Term(s)
Imperial DensityDependentPopulation
Terrain ruggednessIndependentTopography And Geology