Instacart is running fixed effect regressions with PyFixest!

Python
pyfixest
econometrics
Instacart
marketplace experiments
Author

Alex Fischer

Published

July 11, 2026

Instacart logo

Ben Knight from Instacart has published a great write-up on how they use pyfixest “in production” for measuring the effects of marketplace experiments.

For an open source developer, there is of course nothing more rewarding than seeing your software solving a problem in the real world. If you are using PyFixest in your work, please don’t hesitate to send me a note - I am sure it will make my day. =)

You can check out Ben’s article here: Leveraging pyfixest for High-Cardinality Marketplace Modeling at Instacart