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Fig. 3 | BMC Bioinformatics

Fig. 3

From: An Eigenvalue test for spatial principal component analysis

Fig. 3

Plot of the first and second most positive observed eigenvalues of the mtDNA dataset here analysed. The background map represents the countries from where the populations included into the original study were sampled (from West to East: Senegal, Guinea-Bissau, Guinea, Sierra Leone, Liberia, Ivory Coast, Ghana, Togo, Benin, Nigeria, Cameroon, Equatorial Guinea, Gabon, Congo). sPC1 and sPC2 are represented independently using a square size proportional to the value of each population along the first and second component, respectively. Whites squares show negative values and black squares the positive values, with size being proportional to the absolute value of the coordinate. sPC1-sPC2 is a summarized representation of the values along the first and second component assumed by each population, using a color gradient. The maps were produced using rworldmap R package [15]. Genetic data and geographical coordinates of the populations analysed are publicly available from Montano et al. ([14])

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