Hi, I'm performing (blocked) 10-fold cross-validation of a several time series forecasting methods, measuring their mean squared error (MSE). I know that the MSE_cv is the average over the 10 MSEs. Is there a way to calculate the standard error as well? The usual SD/sqrt(n) formula probably doesn't apply here as the 10 observations aren't independent. Thanks, Gad -- Gad Abraham Department of Mathematics and Statistics The University of Melbourne Parkville 3010, Victoria, Australia email: g.abraham at ms.unimelb.edu.au web: http://www.ms.unimelb.edu.au/~gabraham