search for: standiz

...1. the data I want to standardize/centroid is in column format. So I'm thinking of using: col.mean.stdised=apply(data.df,2,function(z){z-mean(z)}) but, what command should I use to put my SD =1? Thanks! -- View this message in context: http://r.789695.n4.nabble.com/what-command-to-use-for-standization-tp2236074p2236074.html Sent from the R help mailing list archive at Nabble.com.

...respoding to each row of the X matrix. I do standardization on X, X1=scale(X, TRUE, TRUE), and Y1=scale(Y, TRUE, FALSE). And I got a regression coefficient vector Beta. I am wondering how to I manipulate this Beta to run the test? Is this Beta the same as the one we would obtain if we don't standization the training data? For testing data, I guess I should not standardize, otherwise, how can my predicted data match with the non-standardized test Y vector? If I do standardization on the test X matrix and Y vector, then I lose my physical meaning of prediction error -- it will be distorted......