Non-Orthogonality in PCA?
9286
Questions on PCA: when are PCs independent? why is PCA sensitive to scaling? why are PCs constrained to be orthogonal?
3589
How to reverse PCA and reconstruct original variables from several principal components?
105175
Variable ordering using PCA
154261
PCA when the dimensionality is greater than the number of samples
157062
Dimensionality reduction (SVD or PCA) on a large, sparse matrix
154757
One component in PCA is always the mean vector in two-dimensions but not three
65888
A counterexample to theorem about orthogonal projection
41608
Weighted principal components analysis
2632
PCA and the train/test split
46319
How to perform orthogonal regression (total least squares) via PCA?
145885
Linear transformation preserving orthogonality
6590
PCA and proportion of variance explained
154628
What should we understand from the definition of orthogonality in inner product spaces other than $\mathbb R^n$?
17025
What exactly is called "principal component" in PCA?
4244
How to compute PCA scores from eigendecomposition of the covariance matrix?
42606
Orthogonality for Binomial Coefficients
97435
Reversing PCA back to the original variables