विधियों की तुलना करें

	समय-परिवर्तनीय सहचर (Covariates) के साथ कॉक्स रिग्रेशन	कैप्लान-मेयर सर्वाइवल एस्टिमेटर
क्षेत्र	उत्तरजीविता	उत्तरजीविता
परिवार	Survival analysis	Survival analysis
उद्भव वर्ष	1972	1958
प्रवर्तक	Cox, D. R. (extended formulation by Therneau & Grambsch)	Kaplan, E. L. & Meier, P.
प्रकार	Semi-parametric hazard regression model	Non-parametric survival estimator
मौलिक स्रोत	Therneau, T. M. & Grambsch, P. M. (2000). Modeling Survival Data: Extending the Cox Model. Springer.	Kaplan, E. L. & Meier, P. (1958). Nonparametric Estimation from Incomplete Observations. Journal of the American Statistical Association, 53(282), 457–481.
उपनाम	time-varying covariate Cox model, extended Cox model, Zamana Bağlı Kovaryatlı Cox Regresyonu	product-limit estimator, km curve, kaplan-meier sağkalım analizi
संबंधित	4	2
सारांश	Time-dependent Cox regression is an extension of the standard Cox proportional hazards model, introduced through the counting-process formulation developed by Therneau and Grambsch (2000), that allows one or more predictor variables to take different values at different points in a subject's follow-up period. It is the method of choice whenever a covariate — such as a laboratory measurement, a medication dose, or a disease severity score — changes over time rather than remaining fixed from study entry.	The Kaplan-Meier estimator, introduced by Kaplan and Meier in 1958, is a non-parametric method that estimates the survival curve — the probability of remaining event-free over time — from right-censored time-to-event data. The log-rank test is the companion procedure used to compare survival curves between groups.