Tutorial: NMF vs PCA in muscle synergy analysis
Companion material for a chapter entitled "Muscle synergy analysis for posture and movement: methods and interpretation" by Ting and Chvatal, to appear in Progress in Motor Control, Danion and Latash, eds., 2010. We use intuitive tutorials to compare the different properties of principal components analysis and non-negative matrix factorization in the decomposition of electromyographic data.