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Latest Questions & Answers

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Hello! I have one question to you. PCA is usually not validated alrorithn beacase it is not a learning method. How does PCA use cross-validation and why is that?…
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I have successfully performed Partial least squares regression. From here, how do I go about generating an equation?…
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How to calculate Y residual variance of factor 0 for PLS cross validation in Unscramber software?…
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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…