Table 3.

Summary of Vuong’s tests of non-nested models comparing power law distributions to alternative distributions (exponential, log-normal, Poisson). The cell indicates the preferred distribution from the comparison; n.d. indicates that no distribution can be favored.

Network	PL vs. Exp	PL vs. LN	PL vs. Pos
PATT	PL	n.d.	PL
Inverse PATT	n.d.	n.d.	PL
Random	n.d.	n.d.	PL
PATT/Inverse PATT
200/800	n.d.	n.d.	PL
400/600	PL	n.d.	PL
600/400	PL	n.d.	PL
200/800	PL	n.d.	PL
Inverse PATT/PATT
200/800	n.d.	n.d.	PL
400/600	n.d.	n.d.	PL
600/400	n.d.	n.d.	PL
200/800	n.d.	n.d.	PL

Legend: PL = power law; LN = log-normal; Pos = Poisson; Exp = exponential; PATT = preferential attachment; n.d. = no difference.