(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers)
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.
Let´s see the three corrgram patterns together: (MSC, 1ª derivative, 2ª derivative)
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
