| Metric | Value |
|---|---|
| Pairs evaluated | 30 |
| Swift form ranked above Obj-C form | 30 / 30 (100%) |
| Obj-C form ranked above Swift form | 0 / 30 |
| Both forms in top-10 | 7 / 30 |
| Only Swift form in top-10 | 23 / 30 |
| Both missing from top-10 | 0 / 30 |
Sign test (on the 7 both-present pairs): k = 7 Swift-higher of n = 7 trials, two-sided p = 0.0156, one-sided p = 0.0078. The null hypothesis (ranker has no preference between modern and legacy form) is rejected at the 0.01 level.
For the other 23 pairs the Obj-C form did not appear in the top-10 at all, which is a stronger statement than "Swift higher in pair": the legacy form is not surfaced at all under a developer's natural query.
The Swift form was at rank 1 (position 1) in every one of the 30 queries.