(This article was first published on NIR-Quimiometria, and kindly contributed to R-bloggers)
Histograms of all the sample sets together and individually
Raw Spectra
Spectra treated with MSC (Multiple Scatter correction)
Spectra treated with SG filters
To leave a comment for the author, please follow the link and comment on his blog: NIR-Quimiometria.
R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series,ecdf, trading) and more...

Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).