analytics-dictionary / tool overview / experimentation

LaunchDarkly

LaunchDarkly is a feature management platform used to control feature rollouts with flags.

Written by Reflective Data experts · updated Oct 5, 2026

Engineering teams use it to ship code safely, target segments and roll back instantly, and it also offers experimentation features.

It is popular where release safety and governance are priorities.

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We set up, audit and run experimentation programs on any tool. A/B testing services → · Audits

A multivariate test changes several elements at once and measures the effect of every combination.

CUPED reduces variance in experiments by using pre-experiment data about each user, so tests reach conclusions…

A sample ratio mismatch is when the actual split of users between variants differs from the…

Client-side testing changes the page in the visitor browser using JavaScript, typically with a visual editor.

Frequentist statistics judges evidence by how likely the data would be if there were no real…

A type I error is a false positive, declaring an effect that is not real; a…