PCA for NIR Spectra_part 002: "Score planes"

February 23, 2012
By

(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers)

The idea of this post is to compare the score plots for the first 3 principal components obtained with the algorithm “svd” with the scores plot of  other chemometric software (Win ISI in this case). Previously I had exported the yarn spectra to this software.
Let´s first use the command "pairs", to see in “R” the score plots for the first 3 PCs:
> T<-Xc_svd$u %*% diag(Xc_svd$d)
> T3cp<-T[,1:3]
> pairs(T3cp)
I only choose two planes to compare, but the rest of the planes have the same shapes as the calculated with the “”svd” in “R”. (Blue background: Win ISI score planes).


To leave a comment for the author, please follow the link and comment on his blog: NIR-Quimiometría.

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, trading) and more...



If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Tags:

Comments are closed.