[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Epidemiology](https://durgical.com/en/epidemiology/) › Survival analysis

# Survival analysis

Kaplan-Meier curves, the log-rank test and the hazard ratio.

7 pages

## Concept

- [**Actuarial life tables** They estimate survival over fixed intervals (for example by year) when the exact date of each…](https://durgical.com/en/epidemiology/actuarial-life-tables/)
- [**Kaplan-Meier curve** A step curve showing what share of people remain free of the event as time passes](https://durgical.com/en/epidemiology/kaplan-meier-curve/)
- [**Survival analysis and censoring** It studies how long it takes until an event, making use of people whose follow-up ends before it…](https://durgical.com/en/epidemiology/survival-analysis-and-censoring/)

## Measure

- [**Five-year and relative survival** Relative survival compares patients with people of the same age and sex without the disease: it…](https://durgical.com/en/epidemiology/five-year-and-relative-survival/)
- [**Hazard ratio and the Cox model** The HR compares how fast events happen in two groups](https://durgical.com/en/epidemiology/hazard-ratio-and-the-cox-model/)

## Statistical test

- [**Log-rank test** It compares whole survival curves: at each event it checks whether a group had more events than…](https://durgical.com/en/epidemiology/log-rank-test/)

## Bias

- [**Stage migration (Will Rogers phenomenon)** Better staging moves patients to a more advanced stage: both stages seem to improve although…](https://durgical.com/en/epidemiology/stage-migration/)

## A to Z

- [A](https://durgical.com/en/epidemiology/a-z/a/)
- [B](https://durgical.com/en/epidemiology/a-z/b/)
- [C](https://durgical.com/en/epidemiology/a-z/c/)
- [D](https://durgical.com/en/epidemiology/a-z/d/)
- [E](https://durgical.com/en/epidemiology/a-z/e/)
- [F](https://durgical.com/en/epidemiology/a-z/f/)
- [G](https://durgical.com/en/epidemiology/a-z/g/)
- [H](https://durgical.com/en/epidemiology/a-z/h/)
- [I](https://durgical.com/en/epidemiology/a-z/i/)
- [K](https://durgical.com/en/epidemiology/a-z/k/)
- [L](https://durgical.com/en/epidemiology/a-z/l/)
- [M](https://durgical.com/en/epidemiology/a-z/m/)
- [N](https://durgical.com/en/epidemiology/a-z/n/)
- [O](https://durgical.com/en/epidemiology/a-z/o/)
- [P](https://durgical.com/en/epidemiology/a-z/p/)
- [Q](https://durgical.com/en/epidemiology/a-z/q/)
- [R](https://durgical.com/en/epidemiology/a-z/r/)
- [S](https://durgical.com/en/epidemiology/a-z/s/)
- [T](https://durgical.com/en/epidemiology/a-z/t/)
- [U](https://durgical.com/en/epidemiology/a-z/u/)
- [V](https://durgical.com/en/epidemiology/a-z/v/)
- [W](https://durgical.com/en/epidemiology/a-z/w/)
- [Y](https://durgical.com/en/epidemiology/a-z/y/)

[← Epidemiology, biostatistics and public health](https://durgical.com/en/epidemiology/)

Educational content on epidemiological and statistical methods; the examples use made-up numbers to teach the calculation. Not a clinical or legal guide: current Colombian rules are in the official sources.

Representative model, for educational purposes only.

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Source: https://durgical.com/en/epidemiology/areas/survival/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/epidemiology/areas/survival/