what model to use to calculate hazard can we re-use survival models in production how to hazard estimate in production r can you use covariates as survival values can production model include historical data? what is the survival model what is survival model which model is based on time-varying covariates for the survival when creating a survival model how to build survival model with covariate what model to use to produce cumulative hazard estimate what is the purpose of survival models? how can i use survival model for production r survival models how to calculate the cumulative hazard can r use the covariates in survival model what is the purpose of survival model when to use survival model and cumulative survival model for production why is survival model based on covariates