cox-models

Cox proportional hazards models are semi-parametric models that relate covariates to the time of an event. The hazard function for individual i is expressed as:

Skills
Scientific
1

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A skill that teaches Claude Code to do scientific tasks well. It is packaged knowledge the model uses whenever it is relevant.

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mkdir -p .claude/skills/cox-models && curl -fsSL https://doutorai.pt/data/lib/skills__cox-models.md -o .claude/skills/cox-models/SKILL.md

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Content

# Cox Proportional Hazards Models

## Overview

Cox proportional hazards models are semi-parametric models that relate covariates to the time of an event. The hazard function for individual *i* is expressed as:

**h_i(t) = h_0(t) × exp(β^T x_i)**

where:
- h_0(t) is the baseline hazard function (unspecified)
- β is the vector of coefficients
- x_i is the covariate vector for individual *i*

The key assumption is that the hazard ratio between two individuals is constant over time (proportional hazards).

## CoxPHSurvivalAnalysis

Basic Cox proportional hazards model for survival analysis.

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