feat: add Western Electric Rules for control chart pattern detection#107
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feat: add Western Electric Rules for control chart pattern detection#107
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Description
Add the four Western Electric Rules (WER) for detecting non-random patterns on control charts: single point beyond ±3σ, 2-of-3 beyond ±2σ same side, 4-of-5 beyond ±1σ same side, and 8 consecutive points on the same side of the center line. Complements the existing Shewhart, CUSUM, and EWMA charts by increasing sensitivity to small sustained shifts.
Closes #38
Testing
./gradlew :kstats-core:jvmTest— 65 new tests covering basic correctness, edge cases, degenerate/NaN/±Infinity inputs, property-based invariants, and Iterable/Sequence overloads.Checklist