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...n't have a clue how to do... and I've only used the simplest PCAs before, like this: pcaObj=prcomp(t(df[idx, c(40:47)])) biplot(pcaObj) Anyone who knows how to do? Best rageds, Joel _________________________________________________________________ Hitta hetaste singlarna på MSN Dejting! http://dejting.se.msn.com/channel/index.aspx?trackingid=1002952 [[alternative HTML version deleted]]

...if(is.na(X[j,i])) # Search for missing value in the given position { X[j,i]=mean(X[1:p, i]) # Change missing value to the mean of the column } } } All the best, Joel _________________________________________________________________ Hitta hetaste singlarna på MSN Dejting! http://dejting.se.msn.com/channel/index.aspx?trackingid=1002952 [[alternative HTML version deleted]]

...I've found that limits can be used in a similar manner as with xlim and ylim, but though I've read about them I don't understand how to solve it... Anyone who can help me? All the best, Joel _________________________________________________________________ Hitta hetaste singlarna på MSN Dejting! http://dejting.se.msn.com/channel/index.aspx?trackingid=1002952 [[alternative HTML version deleted]]

...ey are not grouped and there are 20 additional non-numerical columns in the data frame. By the way, can the iterations be made using R, or do you have to combine with for instance Perl? All the best, Joel _________________________________________________________________ Hitta hetaste singlarna på MSN Dejting! http://dejting.se.msn.com/channel/index.aspx?trackingid=1002952 [[alternative HTML version deleted]]