# Explanation

This section provides conceptual explanations of the methodologies and components used within the Abacus library.

```{toctree}
:maxdepth: 1
:caption: Explanation:

methodology
model_components
loo_cv
model_comparison
optimisation_concepts
```

-   **[Methodology](./methodology.md):** Overview of the core MMM concepts (Bayesian approach, adstock, saturation).
-   **[Model Components](./model_components.md):** Deeper dive into baseline, seasonality, media effects, and control variables.
-   **[LOO-CV & Model Checking](./loo_cv.md):** Understanding Leave-One-Out Cross-Validation and related metrics (ELPD, p_loo).
-   **[Model Comparison](./model_comparison.md):** How Abacus compares to other MMM approaches and tools.
-   **[Optimisation Concepts](./optimisation_concepts.md):** The theory behind the budget optimisation process.