## Cook’s distance

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Hi everyone. Is there a way to obtain values of Cook’s distance in MLR? I am trying to identify influential observations by use of studentized residuals and Cook’s D statistics. This was kind of  advised procedure for a specific problem I am currently dealing with. Thanks in advance.…

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## R squared for SVMR prediction

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I tried making the model with SVMR on my data set having 75% as training set and rest for external prediction the R squared value for calibration and cross validation were quite good, but how to get the R squared value for the Prection data set, I also tried copying the results into excel and [&hell…

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## PLS Regression: Equal scale in PLS predicted vs. measure plot.

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Greeting. Please, which option in Uscramblr 10.3 gives me: Equal scale in PLS predicted vs. measured plot. (I prefer sometimes equal scale instead of auto scale sometimes). Thanks for your cooperation.…

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## Extrapolating Standard Addition with PLS-R

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In a univariate experiment one can add  known amounts of an analyte to a sample. The equation of the linear regression line y=ax+b can then be extrapolated to where y=0. The concentration of the analyte is then equal to the absolute value of x. I like to use this method with near-infrared spectrome…

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## Equation for PLSR

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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 regression ?

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How to calculate Y residual variance of factor 0 for PLS cross validation in Unscramber software?…

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## beta coefficients and Prediction

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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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## How to determine the optimal factor of PLS model

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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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## PLSR calibration of NIR spectra

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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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## Error limits for PLSR model

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When we built a PLSR model and use this model to make predictions, on the unscrambler we obtained RMSEP value which is basically Predicted Value-Reference Value. Can you please guide us as to how we should calculate the standard deviation or error limits for the RMSEP values?…

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