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...osure' I think R transforms the data when importing into R, so that the observations are not numeric anymore. Does anyone know how to handle this problem? Thanks, Marie -- View this message in context: http://www.nabble.com/Error-in-Surv%28time%2C-status%29-%3A-Time-variable-is-not-numeric-tp21674025p21674025.html Sent from the R help mailing list archive at Nabble.com.