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Recently, l started working on yeast data (http://archive.ics.uci.edu/ml/datasets/Yeast). My goal is to do an exploratory statistics upon these data, l applied PCA (principal component analysis ) as a tool of analysis. However l'm not aware of the objective of yeast data , l finally found some...

Hello; l want to know the function and the meaning of the argument select="cos2 9" what does it mean cos2 ? here is my function plot res<- PCA(d,quali.sup<- c(1,10)) and d is mydata plot(res,cex=0.9,shadow=F,habillage=10,invisible=c("ind.sup","quali"),select="cos2 9",unselect=1) Thank...