Table 7.

Likelihood ratio tests (LRT) for the predictors of the (BCT, μ, σ, and ν) GAMLSS model described in Table 6.

	df	AIC	LRT	p-value
μ
Starting model		10,558
s(Distance from Africa)	7.82	10,571	29.28	<0.001
Number of speakers	1	10,556	0.22	0.640
Local linguistic density	1	10,560	4.11	0.043
s(Family)	113.71	10,874	544.30	<0.001
σ
Starting model		10,558
Distance from Africa	1	10,561	5.81	0.016
Number of speakers	1	10,556	0.12	0.726
Local linguistic density	1	10,561	5.39	0.020
s(Family)	51.23	10,600	145.24	<0.001
ν
Starting model		10,558
Distance from Africa	1	10,557	1.39	0.239
s(Number of speakers)	3.22	10,558	7.29	0.074
Local linguistic density	1	10,556	0.09	0.765

P-values lower than 0.05 are in bold.