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Thanks David. Could you show me how to do that in my example ? Thanks, Meghna > On Nov 6, 2017, at 12:58 AM, David Winsemius <dwinsemius at comcast.net> wrote: > > You should stop trying to use matrices on the RHS and using separate vectors to Surv. Instead use a data argument and have the names in your formula refer to column names. > > ? > Davi...

...$TXN, train1_na$REDEEMED_REWARDS ) # Kaplan-Meier non-parametric analysis kmsurvival_np <- survfit(Surv(time_np,event_np) ~ X_np) Error in `[.default`(y, who, 1) : (subscript) logical subscript too long Any ideas? I have tried several things and still get this error. Thanks, Meghna

You should stop trying to use matrices on the RHS and using separate vectors to Surv. Instead use a data argument and have the names in your formula refer to column names. ? David Sent from my iPhone > On Nov 5, 2017, at 7:21 PM, Meghna Govil via R-help <r-help at r-project.org> wrote: > > > Hi - Below is my code and then the error when I run the last line. > > time_np <- train1_na$tte > event_np <- train1_na$censored > > > X_np <- cbind( > train1_na$AMT, > train1_na$DISCOUN...

Hi I'm trying to predict the values for a survreg object called loglogistic_na. Here is the definition of loglogistic_na and following that the syntax used for the predict function. But upon execution I don't get any output. Not sure what I'm doing wrong: loglogistic_na <- survreg(Surv(time_na,event_na) ~ t_na, dist="loglogistic") summary(loglogistic_na)

> Hi > > I'm trying to predict the values for a survreg object called loglogistic_na. Here is the definition of loglogistic_na and following that the syntax used for the predict function. But upon execution I don't get any output. Not sure what I'm doing wrong: > > loglogistic_na <- survreg(Surv(time_na,event_na) ~ t_na, dist="loglogistic") >