FA-74827 / Experiment statistics / Member archive

Percent change log-ratio interval: Interval ends stay on the log scale · case 02

Bounds are reported as log points while the estimate is a percent change.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

L = ln(mean_t / mean_c) with standard error sqrt((se_t / mean_t)^2 + (se_c / mean_c)^2). Report the percent change 100 (e^L - 1) and the interval 100 (e^(L -/+ z se) - 1), each rounded to 4. Nonpositive means -> None.

Why this case matters

Log-ratio intervals keep percent-change bounds asymmetric and positive-definite.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
ten percent increase	`[10.0, 2.9023, 16.1598]`	`[10.0, 2.9448, 17.5387]`	Failed

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