Hi Corentin - did you find a solution yet? I am having the same problem - I'm running principal components on 19 worldclim layers (for an area in W. Europe), and I get numbers in my correlation matrix greater than 1, and less than -1. When i run it on just 2 layers i get a different number in my correlation matrix than between the same two layers when i run all 19 together. Surely that shouldn't be the case, since the correlation between 2 variables should be the same regardless of the other variables. If anyone has any idea what I'm doing wrong, I'd be really grateful for some advice! Sarah
... View more