Why do we need to normalize data before principal component analysis (PCA)?
6316
PCA on correlation or covariance?
154261
PCA when the dimensionality is greater than the number of samples
152419
De Normalize data
41608
Weighted principal components analysis
156944
Is there a test/technique/method for comparing principal components decompositions between samples?
67557
Imputation of missing values for PCA
55662
How to use principal components analysis to select variables for regression?
154899
Is it valid to perform PCA if Kaiser-Meyer-Olkin (KMO) index is very low?
24814
Is PCA still done via the eigendecomposition of the covariance matrix when dimensionality is larger than the number of observations?
101622
Choosing number of principal components to retain
25535
Categorical Principal Component Analysis - using Count, Continuous, Ordinal variables together
81049
What norm of the reconstruction error is minimized by the low-rank approximation matrix obtained with PCA?
48567
Skewed variables in PCA or factor analysis
113346
What is the proper association measure of a variable with a PCA component (on a biplot / loading plot)?
112934
Is PCA followed by a rotation (such as varimax) still PCA?
70917
What's the difference between principal component analysis and multidimensional scaling?
16523
How to compute classification accuracy of PCA?