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Loading plot of PCA


I have spectral data ranging from 200-2600nm.For building AAN models, I have used PCA as data reduction method to reduce the input variables. Based on eigenvalues>1, 14 PC was chosen. Then using graph builder I have plotted the 14 PC vs the Wavelength (200-2600nm) to see which PC's contribute more in the separation and which wavelengths are more dominant. Now I have been questioned how this can be seen from PCA? Enclosed is the plot.



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Re: Loading plot of PCA

So, I think you're doing a classic chemometrics experiement where you are want to use Raman or FTIR or some spectral method to characterize a sample with a known concentration of some analyte. Often the analyte is quantified by HPLC or some other more time consuming method. The goal is to make a model that will allow you to predict the quantity of analyte in the sample using the simple spectroscopic detection method. 


Is this what you are trying to do?

JMP Systems Engineer, Pharm and BioPharm Sciences
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