Cox

Introduction to understanding interaction effects. The lecture describes how to interpret parameter estimates, in both main effects and interaction models, but with a specific emphasis on interactions. Examples use Cox regression, but the principles apply to all models.

Introduction to the Cox proportional hazards regression model.

Understanding the proportional hazards assumption. Testing for proportional hazards. Relaxing the proportional hazards assumption.

An illustration of how one can both approximate and exactly replicate estimates from a Cox model using Poisson regression