How do you update R on Windows and how do you install your own package with windows interface ? regards, Ghislaine GUIGON Biostatisticienne Plate-forme 2 Puces a ADN INSTITUT PASTEUR 25-28 rue du Dr ROUX 75724 Paris cedex 15 FRANCE tel: (33) (0)1 40 61 86 51 fax: (33) (0)1 45 68 84 06