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survival-analysis-guide

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Conduct Kaplan-Meier, Cox regression, and time-to-event analyses

skills/analysis/statistics/survival-analysis-guide/SKILL.md

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# Survival Analysis Guide

A skill for conducting time-to-event analyses including Kaplan-Meier estimation, log-rank tests, and Cox proportional hazards regression. Covers censoring concepts, assumption checking, and reporting standards for clinical and social science research.

## Core Concepts

### What Is Survival Analysis?

Survival analysis studies the time until an event of interest occurs. Despite the name, the "event" need not be death -- it can be any well-defined transition:

```
Medical:      Time to disease recurrence, death, or recovery
Engineering:  Time to equipment failure
Social:       Time to job termination, divorce, or graduation
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