Is it possible for the correlation between principle components to be negative when the correlation of the highest covariant variables is positive?
8333
Does the sign of scores or of loadings in PCA or FA have a meaning? May I reverse the sign?
71626
Superposition of distinct vevs in spontaneous symmetry breaking
94563
What correlation makes a matrix singular and what are implications of singularity or near-singularity?
70734
Entropy and the principle of least action
97109
Can zero covariance and zero expectation imply zero conditional expectation?
155208
Why aren't Christoffel symbols tensors? - asked from a fibre bundle perspective
52827
Could negative dimension ever make sense?
124391
Correlation with a constant
65176
When A and B are positively related variables, can they have opposite effect on their outcome variable C?
39112
Does a correlation matrix of two variables always have the same eigenvectors?
87800
Covariant derivative ambiguity
153393
Is there a *simple* example showing that uncorrelated random variables need not be independent?
155477
Physical meaning of correlation?
150141
Showing $X$, $Y$ are not independent but $\operatorname{Cov}[X, Y] = 0$
18487
Why are there only $n-1$ principal components for $n$ data if the number of dimensions is $\ge n$?
149535
What is the constraint on the Gauge Potential in the Covariant Gauges?
26736
Reason for vanishing of the covariant derivative of energy-momentum tensor of matter in general relativity