---
title: "Methodology"
---

How PolicyEngine US is built and how to read its outputs.

- [Medical out-of-pocket expense decomposition](moop-decomposition.qmd) — the architecture for layering rules-based premium computations on top of CPS-imputed medical costs.

Planned sections (not yet written): microdata construction (enhanced CPS), calibration to administrative totals, behavioral responses, uprating, and validation against NBER TAXSIM and IRS SOI.
