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	Robust Cox Regression	कॉक्स प्रोपोर्शनल हैज़र्ड्स रिग्रेशन	सर्वाइवल रिग्रेशन (Survival Regression)
क्षेत्र	सांख्यिकी	उत्तरजीविता	सांख्यिकी
परिवार	Regression model	Survival analysis	Regression model
उद्भव वर्ष	1989	1972	1980s
प्रवर्तक	Lin & Wei	Cox, D. R.	Kalbfleisch & Prentice; Cox & Oakes
प्रकार	Semi-parametric survival regression with robust variance	Semi-parametric hazard regression model	Parametric survival model
मौलिक स्रोत	Lin, D. Y., & Wei, L. J. (1989). The robust inference for the Cox proportional hazards model. Journal of the American Statistical Association, 84(408), 1074–1078.	Cox, D. R. (1972). Regression Models and Life-Tables. Journal of the Royal Statistical Society: Series B, 34(2), 187–202.	Kalbfleisch, J. D., & Prentice, R. L. (2002). The Statistical Analysis of Failure Time Data (2nd ed.). Wiley. ISBN: 978-0471363576
उपनाम	Cox model with robust standard errors, sandwich-variance Cox regression, Lin-Wei robust Cox model, robust partial likelihood regression	cox ph model, proportional hazards model, cox ph regression, Cox Orantılı Tehlikeler Regresyonu	accelerated failure time model, AFT model, parametric survival model, time-to-event regression
संबंधित	3	3	3
सारांश	Robust Cox regression fits the standard Cox proportional hazards model but replaces the model-based variance estimate with a sandwich (Huber-White) estimator. This yields valid standard errors and confidence intervals even when observations are clustered, the independence assumption is mildly violated, or the working model is slightly misspecified, without discarding the familiar hazard-ratio interpretation.	Cox proportional hazards regression, introduced by D. R. Cox in 1972, is a semi-parametric model that estimates how one or more covariates affect the hazard — the instantaneous rate of experiencing an event — while leaving the baseline hazard function unspecified. It is the standard multivariable method in survival analysis and produces hazard ratios that quantify the relative risk associated with each predictor.	Survival regression models the time until an event occurs — such as death, failure, or relapse — as a function of covariates. Unlike ordinary regression, it properly accounts for censored observations (cases where the event had not yet occurred at the end of follow-up) by specifying a parametric distribution for the survival time and estimating covariate effects via maximum likelihood.