Can I ask what the ellipse argument is used for in PCA? How to analysis the data by different ellipse shape and different direction in statistics? Is there any example for interpretation data by ellipse?
Renaud Lancelot
Which software, which function ?
Usually ellipses are drawn around clusters identified after automatic classification, possibly on pca scores. The centroid is the barycentre of the points belonging to the same cluster, the main axis explaining the max of variance, etc.
Here is a dummy example with R
library(ade4)
## dummy data
set.seed(1)
mu
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