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In analytical chemistry, it is necessary to form instrument-dependent calibration models. Problems such as instrument drift, repair, or use of a new instrument create a need for recalibration. Since recalibration
can require considerable costs and cause time delays, methods for calibration transfer have been developed. This paper shows that many of these approaches are based on the statistical procedure known as
Procrustes analysis (PA). Transfer by PA methods is shown to involve translation (mean-centering), rotation, and stretching of instrument responses. This study investigates the ability of different forms
of PA to transfer near-infrared spectra measured on two different instruments. Spectroscopic interpretations of translation, rotation, and stretching are provided. It is found for the data sets investigated
that unconstrained forms of PA generally produce better results. It is also shown that translation is the key step for transformation of spectra and may often be all that is required.
The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)