11 nov. 2018

Variable Importance in NIR "PLS" Models (CARET)

This is a function of the R Caret package to check the importance of the variables in a regression. In the case of the model developed with the sunflower seed to determine oleic acid (model_oleic), we can plot it and check which variables have more importance and this is done with a simple step:
And the best way to check it is plotting the results as a spectrum:
        ylim =c(min(varImp_pls$importance)-0.1,
To obtain this spectra:
We can see that the zone of 1700 to 1800 has higher important than the rest due to the peaks linked to the "oil" around 1720 and 1760 nm.

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