Exercise
Perform a PCR by successive application of PCA and MLR

Principal component regression may be carried out as consecutive application of PCA and MLR. Go to the  DataLab  using the data set BENZ which contains spectral information (NMR) and the relative octane numbers for various brands of gasoline .

Try to estimate the octane number (variable ROZ) from the spectral information by using a combination of PCA and MLR. Keep in mind that the principal component analysis should be carried out without the ROZ variable.

Compare the results to the direct application of PCR (which is of course much more convenient).