Table 2. Variation in African ancestry modeled by historical and geographical variables using multiple linear regression.

All island
Adjusted R2 = 0.075
	β estimate	S.E.	t	P
(Intercept)	−0.5676	0.02727	−20.81	<10−4
Distance to sugar mills (km)	−0.00195	0.00075	−2.59	0.0097
Distance to coast (km)	−0.00646	0.00145	−4.46	<10−4
Molasses production (m3/km)	−0.00141	4.0 · 10−5	−4.42	<10−4

African ancestry is log10-transformed to assume a linear fit and satisfy model assumptions (e.g. normality of errors). Separate models for the whole island, the East region and the other 5 regions combined have been constructed. For a detailed description of the models and the variables, see Text S1 and Tables S3.