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...g keywords). Any help would be very much appreciated. Thank you. Regards, -- Adaikalavan Ramasamy ramasamy at cancer.org.uk Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Wolfson College Annexe Tel : 01865 284 408 Linton Road, Oxford OX2 6UD Fax : 01865 284 424

Hello guys, I am wondering the default way of transferring arguments in R. Is it by value or by ref in default case, or could that be changed explicitly? Cheers, Xiaofan --- Xiaofan Li Department of Applied Mathematics and Theoretical Physics University of Cambridge

...s over 1 million rows with 5 or 6 variables to check and replace missing values. Thanks in advance for any help. Gary ------------------------------------ Dr Gary S Collins Medical Statistician Centre for Statistics in Medicine Wolfson College Annexe University of Oxford Linton Road Oxford, OX2 6UD Tel: +44 (0)1865 284418 Fax: +44 (0)1865 284424 www.csm-oxford.org.uk

...se contact the managing Recruiter, Tom Carver at MDL Howarth. DDL: 0844 879 4570 (dialling from the UK only) MOB: +44 (0)7916 140 978 tom.carver at mdlhowarth.com www.mdlhowarth.com Many thanks in advance. Rgds Tom Carver First Floor, Indigo House, Holbrooke Place, Richmond, TW10 6UD DDL: 0844 879 4570 (dialling from the UK only) MOB: +44 (0)7916 140 978 tom.carver at mdlhowarth.com www.mdlhowarth.com _____________________________ This e-mail and any files transmitted with it are confid...{{dropped:28}}

Dear all, Is there any simple way in R that can I put the all the interactions of the variables in the OLS model? e.g. I have a bunch of variables, x1,x2,.... x20... I expect then to have interaction (e.g. x1*x2, x3*x4*x5... ) with some combinations(2 way or higher dimensions). Is there any way that I can write the model simpler? Thanks! Leaf