A/B sample size
3,841 per armTwo-sided normal approximation, 1:1 allocation, 80% power, α = 5%, without attrition or design effect.
Research & Evidence · Calculation
Reproducible tools
Each calculator exposes its inputs, result and the boundary that prevents a simulation from becoming a recommendation.
Reproducible tools 05 / 05
MSC-T01 — MSC-T08
Five calculations, five interpretation boundaries.
Each tool exposes the calculation and states what it does not prove.
Difference-in-differences
Difference-in-differences: +7.0 index pointsDescriptive 2×2 contrast; causal only when the design supports parallel trends.
Constant elasticity
-6.6%Conditional scenario, not a price recommendation.
Price-volume-margin
P₀ 100 € · VC 55 € · Q₀ 10 000
Contribution change: +3.8%Conditional scenario, not a price recommendation.
MSC-P-024 →Monte Carlo
Probability of positive contribution: ≈ 99.9% (MC SE ≈ 0.1 pp · Wilson 95% CI ≈ 99.6–100.0%)2,000 fixed-seed draws; only elasticity follows an unbounded normal, without MSC-010 dependencies.
MSC-P-034 →