Fig. 1: The principal component analysis plot of the 1306 GWAS samples.
From: Genome-wide association study of early-onset bipolar I disorder in the Han Taiwanese population
The Y and X axes are the first and second dimensions from principal component analysis based on the genome-wide IBS pairwise distances among the 1306 GWAS subjects. Green crosses represented early-onset and pink non-early-onset BPI. The two axes correspond to a reduced representation of 10,000 randomly selected SNPs into two dimensions. No clustering pattern was found, indicating that neither substantial population stratification nor cryptic relationship among the 1306 subjects was found.
