Figure 1From: Comparison of methods for correcting population stratification in a genome-wide association study of rheumatoid arthritis: principal-component analysis versus multidimensional scalingPopulation structures identified by PCA and MDS. A, The first six principal components are plotted against one another with RA status distinguished by shading; B, the first six MDS dimensions are plotted against one another with RA status distinguished by shading.Back to article page