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Sorry for the repeat. The PRESS statistic is defined as sum(y-yhat(i))^2, where yhat(i) denotes the ith predicted value using all the data except the ith case (as used typically in linear models). Thanks again Jacob Jacob L van Wyk Department of Mathematics and Statistics Rand Afrikaans University P O Box 524 Auckland Park 2006 South Africa Tel: +27-11-489-3080 Fax: +27-11-489-2832

Hi everyone, Being new to the crowd of R users I am wondering what the equivalent of attach("/home/bla/hoffmann/R/.RData",2) (S style) is in R. What I want is a split of .RData repositories. One in a central place where I keep functions and interesting stuff important for all work I am doing, an several others which contain stuff of an dividual project only. When I start in a