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| Ανάλυση Ισχύος για Μελέτες Επιβίωσης× | Εκτιμητής Επιβίωσης Kaplan-Meier× | |
|---|---|---|
| Πεδίο≠ | Στατιστική | Ανάλυση Επιβίωσης |
| Οικογένεια≠ | Hypothesis test | Survival analysis |
| Έτος προέλευσης≠ | 1981 | 1958 |
| Δημιουργός≠ | — | Kaplan, E. L. & Meier, P. |
| Τύπος≠ | Sample size determination for survival outcomes | Non-parametric survival estimator |
| Θεμελιώδης πηγή≠ | Schoenfeld, D. A. (1981). The asymptotic properties of nonparametric tests for comparing survival distributions. Biometrika, 68(1), 316–319. DOI ↗ | Kaplan, E. L. & Meier, P. (1958). Nonparametric Estimation from Incomplete Observations. Journal of the American Statistical Association, 53(282), 457–481. DOI ↗ |
| Εναλλακτικές ονομασίες≠ | log-rank power analysis, cox regression power analysis, survival power analysis, Sağkalım Analizi Güç Analizi | product-limit estimator, km curve, kaplan-meier sağkalım analizi |
| Συναφείς≠ | 6 | 2 |
| Σύνοψη≠ | Power analysis for survival studies determines how many participants — and how many observed events — are required so that a log-rank test or Cox regression has a sufficient probability of detecting a clinically meaningful difference in survival between groups. The foundational formulas were derived by Schoenfeld (1981) and Lachin (1981) and remain the standard approach in clinical trial planning. | 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. |
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