I am having trouble adding grouping variable ellipses on top of an individual site PCA factor plot which also includes PCA variable factor arrows. My code: prin_comp<-rda(data[,2:9], scale=TRUE)...

In the example ggbiplot script plot there are 3 groups, how can I change the marker colors and shapes? library(ggbiplot) data(wine) wine.pca <- prcomp(wine, scale. = TRUE) ggbiplot(wine.pca, ob...

Using ggord one can make nice linear discriminant analysis ggplot2 biplots (cf chapter 11, Fig 11.5 in "Biplots in practice" by M. Greenacre), as in library(MASS) install.packages("devtools") libr...

I am working on an ordination package using ggplot2. Right now I am constructing biplots in the traditional way, with loadings being represented with arrows. I would also be interested though to us...

I'm trying to do a PCA analysis of my data using R, and I found this nice guide, using prcomp and ggbiplot. My data is two sample types with three biological replicates each (i.e. 6 rows) and aroun...

I'm trying to plot a principal component analysis using prcomp and ggbiplot. I'm getting data values outside of the unit circle, and haven't been able to rescale the data prior to calling prcomp in...

Hi everyone I have a simple question but for which i havent been able to get an answer in any tutorial. Ive done a simple principal component analysis on a set of data and then plot my data with bi...