RT Journal Article SR Electronic T1 Statistical and conceptual challenges in the comparative analysis of principal components JF bioRxiv FD Cold Spring Harbor Laboratory SP 007369 DO 10.1101/007369 A1 Josef C. Uyeda A1 Daniel S. Caetano A1 Matthew W. Pennell YR 2014 UL http://biorxiv.org/content/early/2014/07/22/007369.abstract AB