(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers)
With the "Corrgram" package we can see patterns that can help us to recognize possible inter-correlations in a big matrix. This could be the case to see the correlation to every wavelength respect to all others. This way we can see the high correlation respect to their neighbors and between the different overtones.
I have selected just 40 (in steps of 2nm) consecutives wavelengths in this case.
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Zuur, Saveliev, Ieno (2012).
