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Latest Questions & Answers

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I have tested the Unscrambler method you have provided script (add a constand 1 percent of Factor-0. However, the results were not match with the Unscrambler recommend.  The Y residual variance for Brix, dry matter and Flesh color had been uploaded. Could you help me to test the results for how Uns…
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I find that PLS prediction using calibration model was the same (or very similar) as computation (prediction) using beta coefficients obtained from the same calibration model only for mean-centering modeling (or other regression models as well) only when without any preprocessing. However, when I ad…
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Just like I provided the Y explained variance of cross validation. The optimal factor is 8 that The Unscrambler gave. I want to know how to determine the optimal factor by calculation algorithm not by eyes. Thank you very much. Xudong  …
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Regarding to PLSR calibration of concentrations from NIR spectra, Let say, there are measurements at 200 wavelengths, then how many concentration measurements is suitable mathematically ? Minimum number, maximum number, optimal number. Please assume there are no colineaity problem. For example, is e…
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Dear All,   I\’m doing PLS Model and have message ratio of calibrated to validate residual variance for 3 factor. what does it mean and how I can manage it?   Thank you in advance.…
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I have been doing PLS analysis on NIR spectroscopy of apple and egg. In both cases absorbance are used in the Y-axis and Wavelength in X-axis. In NIR diagram of raw data, What are absorbance, reflectance? When should each of them be used? What is the physical meaning of absorbance for apple sweetnes…