"R": PLS Regression (Gasoline) - 005

Let´s see know how to plot the scores for the 3 PLS Components:

 

We can see the explained variance from each component in the diagonal.

We can get it from R with:

> explvar(gas1)

  Comp 1      Comp 2     Comp 3     Comp 4     Comp 5     Comp 6

70.9656438  7.5943956  7.5871843  9.2537926  0.7201960  0.8472951

   Comp 7    Comp 8      Comp 9    Comp 10

 0.3538649  0.7810986  0.2184760  0.3878373

We can change  “scores” for  “ loadings”, and  get the plot of the 3 loadings together:

or one by one:

We can plot also the regression coefficients spectrum, or to see the values in numbers:

> coef(gas1,comp=3)

        octane

900 nm   0.1491498386

902 nm   0.1468577061

904 nm   0.1463829295

906 nm   0.1478201762

908 nm   0.1511718253

910 nm   0.1521591068

912 nm   0.1756188138

914 nm   0.1561727797

916 nm   0.1580512737

918 nm   0.1342321544

920 nm   0.1140515422

922 nm   0.1154623941

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Bibliography:

Tutorials PLS Package for "R" :

Bjorn-Helge Mevik

Norwegian University of Life Sciences

Ron Wehrens

Radboud University Nijmegen

R Help Web page