Dette, HolgerSchorning, Kirsten2012-11-192012-11-192012-11-19http://hdl.handle.net/2003/2979810.17877/DE290R-4934In a recent paper Yang and Stufken (2012a) gave sufficient conditions for complete classes of designs for nonlinear regression models. In this note we demonstrate that their result is a simple consequence of the fact that boundary points of moment spaces generated by Chebyshev systems possess unique representations.enDiscussion Paper / SFB 823;55/2012admissible designChebyshev systemcomplete classes of designslocally optimal designmoment spacesprinciple representations310330620Complete classes of designs for nonlinear regression models and principal representations of moment spacesworking paper