More Spectra patterns (1ª derivative)
In the case of the first derivative for the absortion band, the maximum becomes a cero crossing.
Using SG filters, we can calculate it with R, and to see, like in the last posts, the Corrgram matrix.
Corrgram for the first derivative for this band:
Let´s see the three corrgram patterns together: (MSC, 1ª derivative, 2ª derivative)
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