วันพุธที่ 12 กุมภาพันธ์ พ.ศ. 2557

Non-linearity can be accounted for by extra latent variables of PLS

"So far there does not seem to be convincing evidence that nonlinear techniques, such as ANNs or kernel- ased methods can really offer advantages with respect to the classical linear algorithms. This is due to the fact that NIR spectroscopy is essentially a very linear technique. Further, Li et al. (1999) stated that both PCR and PLS can provide linear approximations to subtle deviations from ideal linear behaviour by using extra latent variables to account for the nonlinearity."

(Nicolaï, B.M., Beullens, K., Bobelyn, E., Peirs, A., Saeys, W., Theron, K.I., Lammertyn, J.
Nondestructive measurement of fruit and vegetable quality by means of NIR spectroscopy: A review (2007) Postharvest Biology and Technology, 46 (2), pp. 99-118. )

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