PCA standard deviations reported by princomp() in R do not match eigenvalues of the covariance matrix
50490
Why do the R functions 'princomp' and 'prcomp' give different eigenvalues?
45858
How to compute varimax-rotated principal components in R?
103409
Mathematica won't give eigenvectors but Wolfram Alpha will? What am I doing wrong?
89237
PCA: Eigenvectors of opposite sign and not being able to compute eigenvectors with `solve` in R
6206
How does centering make a difference in PCA (for SVD and eigen decomposition)?
39112
Does a correlation matrix of two variables always have the same eigenvectors?
37653
Singular covariance matrix in Mahalanobis distance in Matlab
139690
Which variables should I transform, center, and/or standardize in my data for Principal Component Analysis?
14381
I'm getting "jumpy" loadings in rollapply PCA in R. Can I fix it?
58017
When is it necessary to estimate the covariance matrix instead of calculating it directly?
7779
How does centering the data get rid of the intercept in regression and PCA?
25410
What is an intuitive explanation for how PCA turns from a geometric problem (with distances) to a linear algebra problem (with eigenvectors)?
95717
Same eigenvalues, but not similar
104487
Finding Bias$(s^2)$ in incorrect linear model
48567
Skewed variables in PCA or factor analysis
2632
PCA and the train/test split
105646
Problem with plotting eigenvalues