how to use covariate in cox regression how to make covariate in cox regression how to create an interaction term for a covariate what is the interaction term in a cox regression equation what is the interaction term used to create a covariate? how does time interaction work in cox regression what is the relationship between a covariate and time? cox correlation coefficient definition how to find the interaction in a cox regression model covariate interaction term definition how to add covariate interaction in cox regression why would covariate be multiplied by time? why is there an interaction between the predictor and the time how do you make a covariate interaction in cox? what is a covariate interaction term in cox regression if a predictor is multiplied by time, how is this used in regression model how is the covariate interaction term calculated by ck regression can you combine a time and a covariate a covariate is always an interaction term for a time period or covariates if a covariate is only one per subject is it multiplied by the time