[R] confidence interval and cross validation

Marta Rava marta at biometria.univr.it
Mon May 23 12:16:24 CEST 2005

I've obstained the mean square error of prediction, using a 10 fold cross validation for a linear multiple regression model (I've used errortest, from package ipred), how can I calculate the confidence interval? And, could I use test set of cross validation to calculate correlation and concordance index? 
Thanks, Marta

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