PHREG
PHREG is a command used in statistical software, particularly in Stata, for estimating Cox proportional hazards models. This type of regression is a semi-parametric statistical model used to analyze the relationship between the survival time of a subject and one or more predictor variables. The Cox proportional hazards model is widely used in medical research, survival analysis, and reliability engineering to understand factors that influence the time until an event of interest occurs, such as death, disease recurrence, or equipment failure.
The PHREG command in Stata allows users to specify the survival time variable, the censoring indicator, and
PHREG can also handle various extensions of the basic Cox model, including the inclusion of time-dependent