# TROP: Triply Robust Panel Estimator

`trop` is a Python package implementing the **Triply Robust Panel (TROP)** estimator for average treatment effects (ATEs) in panel data. The core estimator is expressed as a weighted two-way fixed effects (TWFE) objective, with an optional low-rank regression adjustment via a nuclear-norm penalty.


Reference:

> Susan Athey, Guido Imbens, Zhaonan Qu, Davide Viviano (2025).  
> *Triply Robust Panel Estimators*.  
> arXiv:2508.21536.

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## Links

- **Documentation**: https://ostasovskyi.github.io/TROP-Estimator/
- **Source code**: https://github.com/ostasovskyi/TROP-Estimator

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## Installation

```
pip install trop
```