Eigenvalue distribution for principal components. The eigenvalues for each PC are shown. Comparing the eigenvalue of each PC shows the relative amount of variation that is explained by the different PCs. The plateau in eigenvalues generally corresponds to variation that can not be attributable to discernable groupings of subjects.
Nassir et al. BMC Genetics 2009 10:39 doi:10.1186/1471-2156-10-39