Re: [NMusers] Time-to-event analysis with $DES

2011-03-23 Thread Nick Holford
Hyewon, The most obvious problem with your code is in $DES. You must use the variable T not the variable TIME when referring to a time varying hazard. TIME is the time on each data record. It does not change in $DES. T is the time from the last data record upto the current data record and cha

Re: [NMusers] Time-to-event analysis with $DES

2011-03-23 Thread Emmanuel Chigutsa
Hi Hyewon My 2 cents of advice: 1. Note that you need to estimate the baseline hazard. You can then add AUC as a covariate on the baseline hazard, or perhaps the Weibull shape factor. 2. Because of my limited experience, I am not sure of the type of survival distribution you are trying to model, bu

[NMusers] Time-to-event analysis with $DES

2011-03-23 Thread Hyewon Kim
Dear NMuser I am trying to analyze time to repeated event data using NONMEM. The response were obtained till 24 hours after drug administration. Inhibitory Emax model was implemented. I am getting unreasonable parameter estimates which is far beyond what data say. If some body can point out what i