Appearance of Discontinuities in Spectra Transformed by the Piecewise Direct Instrument Standardization Procedure
- 1 September 1996
- journal article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 68 (17) , 2913-2915
- https://doi.org/10.1021/ac9604191
Abstract
Several years ago, we noted that spectra transformed by the piecewise direct standardization (PDS) method may contain discontinuities. Having noticed that the problem was a recurring one, we studied it and recently diagnosed its source. Our investigations suggest that this problem also occurs in applications of window factor analysis, evolving factor analysis, and any other procedure that uses piecewise principal component models. In this work, we report the source of the problem and illustrate it with one example. A procedure is presented for eliminating the problem that is effective in PDS pattern recognition applications. Further work is needed to develop modified algorithms suitable for calibration applications.Keywords
This publication has 6 references indexed in Scilit:
- Additive Background Correction in Multivariate Instrument StandardizationAnalytical Chemistry, 1995
- Calibration Transfer and Measurement Stability of Near-Infrared SpectrometersApplied Spectroscopy, 1992
- Improvement of multivariate calibration through instrument standardizationAnalytical Chemistry, 1992
- Multivariate instrument standardizationAnalytical Chemistry, 1991
- Combination of the Mahalanobis distance and residual variance pattern recognition techniques for classification of near-infrared reflectance spectraAnalytical Chemistry, 1990
- Raw materials testing using soft independent modeling of class analogy analysis of near-infrared reflectance spectraAnalytical Chemistry, 1989