# Decision Theory

## Table of Contents

## Risk

**Posterior risk:**

**(Frequentist risk):**

**Bayesian risk:**

## Covariate shift

We assume that

but

The difference between the two domains is called **covariate shift**.

**Posterior risk:**

**(Frequentist risk):**

**Bayesian risk:**

We assume that

but

The difference between the two domains is called **covariate shift**.