Methodology & Statistics Archives

Symmetrical geometric pattern illustrating the combinations of a multivariate test

Tom BlastOptimize
November 4, 2026

Test multivarié : définition, exemples et quand l’utiliser (plutôt qu’un A/B)

Mis à jour le 4 novembre 2026 Sommaire Qu'est-ce qu'un test multivarié ? La formule : pourquoi les combinaisons explosent vite 3 exemples concrets de tests multivariés Quand choisir le MVT plutôt qu'un A/B ou A/B/n Combien de trafic faut-il réellement ? Les limites et pièges du test multivarié L'alternative…

False positives in A/B testing: sample imbalance between groups

Tom BlastOptimize
September 25, 2026

False positives in A/B testing: the causes we don't see

Updated September 25, 2026 — Understanding false positives in A/B testing before they skew your decisions. Contents: A false positive, beyond the purely statistical definition; Sample Ratio Mismatch: the false positive that doesn't speak its name; Contamination by bots…

A/B testing KPI hierarchy: primary metric, guardrails, and diagnostics

Tom BlastOptimize
September 21, 2026

A/B testing KPIs: which ones to track and in what order (2026)

Updated September 21, 2026 Contents A/B Test KPIs: A Three-Level Hierarchy Choosing Your Primary Metric Guardrail Metrics: What Protects Your Business While You Optimize The 10 Most Used KPIs in A/B Testing The Novelty Effect:…

Abstract black and white curve evoking a statistical distribution of the A/B test

Tom BlastOptimize
September 18, 2026

Statistical Significance of an A/B Test: The Complete Guide

Updated September 18, 2026 Contents Statistical significance in a nutshell Type I and Type II errors: the two ways to go wrong P-value and confidence interval: what they really say The "peeking" trap: why look too closely at your results…

Grid of geometric squares illustrating the combinations of a multivariate test

Tom BlastOptimize
September 16, 2026

A/B testing vs multivariate testing (MVT): what's the difference?

Updated September 16, 2026 Contents The difference in one sentence How a classic A/B test works How a multivariate test works Why MVT requires so much more traffic: the real statistical reason When to choose A/B testing When to choose multivariate testing 5 reasons to…

BlastOptimize – Taille echantillon test fiable

Tom BlastOptimize
August 30, 2026

What sample size is needed for a reliable test?

This is one of the most frequently asked questions by teams starting out with A/B testing: how many visitors, or how many conversions, are needed before a test result can be considered reliable? The answer isn't a one-size-fits-all figure—it depends on the initial conversion rate…

Methodology & Statistics

Test multivarié : définition, exemples et quand l’utiliser (plutôt qu’un A/B)

False positives in A/B testing: the causes we don't see

A/B testing KPIs: which ones to track and in what order (2026)

Statistical Significance of an A/B Test: The Complete Guide

A/B testing vs multivariate testing (MVT): what's the difference?

What sample size is needed for a reliable test?

Test multivarié : définition, exemples et quand l’utiliser (plutôt qu’un A/B)

A/B testing of pricing pages: method, calculations and pitfalls to avoid

Call to action that converts: how to write it and prove it with A/B testing

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