when to use covariate in survival can you predict survival with covariates what is the problem in the survival model when using time varying covariates? how to predict survival probabilities which model is used to predict survival when do the survival probabilities come how to predict risk using covariates how do you predict survival with covariate how to model survival in r do time varying covariates cause regression when using predicting probability model, how do you determine survival probability? how to predict survival probability predicting a person's survival by covariate what is r survival why do survival models have covariates in their analysis what models are used to predict survival what is the cox model of survival predicting survival probability using covariates when predicting survival probability when predicting survival probability