Hampus Poppius

Hampus Poppius's articles

See All Blog Articles

Bad controls: why splitting your experiment on a post-treatment variable backfires

Data Science

Experiments

Bad controls: why splitting your experiment on a post-treatment variable backfires

Hampus Poppius

August 31, 2026

Segment analysis in experimentation: how to avoid fooling yourself

Data Science

Experiments

Segment analysis in experimentation: how to avoid fooling yourself

Hampus Poppius

August 28, 2026

Why summing your experiment wins overstates impact

Experiments

Guides

Data Science

Featured

Why summing your experiment wins overstates impact

Hampus Poppius

July 9, 2026

What does a holdout test actually measure?

Experiments

Guides

Data Science

Featured

What does a holdout test actually measure?

Hampus Poppius

July 9, 2026

A practitioner's guide to treatment effects in experimentation: ATE, CATE, ITT, LATE & ATT explained

Experiments

Guides

Data Science

Featured

A practitioner's guide to treatment effects in experimentation: ATE, CATE, ITT, LATE & ATT explained

Hampus Poppius

May 1, 2026

Your experiment lift is an average — which users actually benefited?

Experiments

Analytics

Data Science

Your experiment lift is an average — which users actually benefited?

Hampus Poppius

April 1, 2026

Ready to ship faster?

No credit card required. Start with feature flags, experimentation, and product analytics — free.

Get Started

Book a Demo

Simplified white illustration of a right angle ruler or carpenter's square tool.

White checkmark symbol with a scattered pixelated effect around its edges on a transparent background.

Kargo shows how to shift the mindset on losing experiments

AI Visual Editor: from idea to live experiment in minutes

Box uncovered these interesting surprises that reshaped how they run e-commerce experiments

Diligent reveals the PM's most costly mistake in experimentation

AI coding agents and A/B testing: how to automate the experiment lifecycle

How to avoid false positives in high-velocity experimentation

Why summing your experiment wins overstates impact

What does a holdout test actually measure?

Rebuilding the GrowthBook AI Visual Editor