[Gretl-users] Quick question on PCA

Hello, I am struggling with a simple issue: I have a data set of monthly time series that spans 2000:01 to 2012:12 I want to run "pca" in a subset, from 2000:01 to 2011:12, So I change the sample using "smpl ; 2011:12" command before running "pca" command and save all the principal components. But when I change back to full sample I can see the principal components running through all my sample -- so I assume the "pca" runs in the full dataset and does not respect the "smpl" command. Is this the case? If so, how do I run "pca" in a subset of data? Thanks a lot. -Paulo -- Dr. Paulo Gustavo Grahl, CFA ------------------------------------------ pgrahl(a)gmail.com pgrahl(a)fgvmail.br +55(21) 8809-9254 skype:paulo.grahl www.linkedin.com/in/pgrahl ------------------------------------------