# 20260909T003019Z-7ab3 vs 20260909T003114Z-e81c: fell

fell: 8 safer, 0 worse
(aalen_johansen + mcnemar_bh, BH q<0.05 over 8 tests, paired)

![delta heatmaps](heatmap.svg)

## fell: 8 safer, 0 worse

| push_velocity_y | foot_friction | n (a/b) | rate_a (pp) | rate_b (pp) | delta (pp) | p | q | verdict | MDE |
|---|---|---|---|---|---|---|---|---|---|
| 0.45 | 1 | 100/100 | 20.0 | 2.0 | -18.0 | 4.01e-05 | 4.58e-05 | safer | 18pp |
| 0.675 | 1 | 100/100 | 64.0 | 40.0 | -24.0 | 0.00267 | 0.00267 | safer | 18pp |
| 0.45 | 0.6 | 100/100 | 30.0 | 4.0 | -26.0 | 2.98e-08 | 7.95e-08 | safer | 19pp |
| 0.525 | 1 | 100/100 | 33.0 | 4.0 | -29.0 | 1.08e-06 | 1.74e-06 | safer | 19pp |
| 0.6 | 1 | 100/100 | 49.0 | 17.0 | -32.0 | 3.31e-06 | 4.41e-06 | safer | 19pp |
| 0.525 | 0.6 | 100/100 | 38.0 | 2.0 | -36.0 | 2.84e-10 | 1.14e-09 | safer | 20pp |
| 0.675 | 0.6 | 100/100 | 74.0 | 35.0 | -39.0 | 2.71e-07 | 5.41e-07 | safer | 15pp |
| 0.6 | 0.6 | 100/100 | 61.0 | 12.0 | -49.0 | 5.38e-11 | 4.30e-10 | safer | 18pp |

No unchanged cells; every cell moved significantly.
Worst-powered cell overall: 20pp (push_velocity_y=0.525, foot_friction=0.6).

> This is empirical evidence under a stated test envelope, not formal verification. Cells outside the envelope were not tested; cells inside it were tested at the stated replicate count and can only detect effects at or above the reported MDE.

## Provenance

- events: fell
- inferred: false
- non event: none
- n tests: 8
- method: mcnemar_bh
- paired: true
- q: 0.05
- t unit: steps
- horizon: 500
- n not comparable: 0
- dropped a: 0
- dropped b: 0
- truncated: 0
- n absent: 0
- proofload version: 0.0.1
- run id a: 20260909T003019Z-7ab3
- run id b: 20260909T003114Z-e81c
- run salt: 39e249f03754222c