PCA standardization is part of the types of standardization algorithms used in Win ISI. We start with a REP file with a certain scan spectra from two different instruments (same samples scanned on both instruments and giving the same name to them). When we select PCA standardization we go to the option "Create a Score file from a spectra file", and we see that the option to create a PCS file is activated, so when we do it, apart from to get a PCS file we get also a PCA file.
This PCS file is used after to reduce our CAL file ( the one we use to develop the calibration). When we use "Reduce", we see how we can use a PCS file as optional:
We will use the reduced output file to develop the calibration.