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	Analisi di Kaplan-Meier aggiustata per il rischio	Inverse Probability of Treatment Weighting (IPW / IPTW)
Campo	Epidemiologia	Inferenza causale
Famiglia	Process / pipeline	Regression model
Anno di origine	2001–2004 (formal statistical framework for weighted KM curves)	2000
Ideatore	Conceptual basis: Kaplan & Meier (1958); risk-adjustment via IPTW formalised by Hernán, Brumback & Robins (2001), with practical implementation by Cole & Hernán (2004)	Robins, Hernán & Brumback
Tipo	Adjusted non-parametric survival method	Causal inference weighting estimator
Fonte seminale	Cole, S. R., & Hernan, M. A. (2004). Adjusted survival curves with inverse probability weights. Computer Methods and Programs in Biomedicine, 75(1), 45–49.	Robins, J. M., Hernán, M. A., & Brumback, B. (2000). Marginal Structural Models and Causal Inference in Epidemiology. Epidemiology, 11(5), 550-560.
Alias	weighted Kaplan-Meier, IPTW-adjusted Kaplan-Meier, propensity-score-weighted survival curves, adjusted survival curves	IPW, IPTW, inverse probability of treatment weighting, marginal structural model weighting
Correlati	5	5
Sintesi	Risk-adjusted Kaplan-Meier analysis combines the non-parametric Kaplan-Meier estimator with inverse probability of treatment weighting (IPTW) or similar risk-adjustment procedures to produce survival curves that are comparable across groups as if the groups had identical distributions of baseline confounders. It is the observational-study analogue of plotting survival curves from a randomised trial.	Inverse Probability Weighting is a causal-inference method that assigns each observation a weight equal to the inverse of its probability of receiving the treatment it actually received. Introduced by Robins, Hernán and Brumback (2000) for marginal structural models, it builds a pseudo-population in which treatment is independent of measured confounders, balancing selection bias.