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Figure 4. Comparison of (a) six feature sets using linear discriminant analysis (LDA) classifier and (b) five classifiers using autoregressive (AR) feature set. Source: Reprinted with permission of IEEE from Hargrove LJ, Englehart K, Hudgins B. A comparison of surface and intra-muscular myoelectric signal classification. IEEE Trans Biomed Eng. 2007;54(5):847–53. [PMID: 17518281]DOI:10.1109/TBME.2006.889192. Scheme E, Englehart K. Electromyogram pattern recognition for control of powered upper-limb prostheses: State of the art and challenges for clinical use. J Rehabil Res Dev. 2011;48(6):643-60.DOI:10.1682/JRRD.2010.09.0177