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feat: Implement Butterworth Filter with tests and documentation

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Miha Kralj
2025-12-22 22:45:27 -08:00
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docs/trendcomparison.md
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@@ -12,6 +12,7 @@ Scale 1–10 where **10 = better** for every column. Detailed evaluation criteri
| **ALMA** | 8 | 7 | 10 | 8 | Positive-weight FIR; accurate-ish but still a lag tradeoff. |
| **BESSEL** | 9 | 7 | 9 | 8 | Strong shape/phase preservation; step response is well-behaved. |
| **BILATERAL** | 7 | 6 | 10 | 8 | Edge-preserving; excellent in ranging markets, variable smoothing by design. |
| **BUTTER** | 7 | 7 | 8 | 9 | 2nd-order IIR; maximally flat passband, excellent balance of smooth/lag. |
| **BLMA** | 7 | 3 | 10 | 10 | Standard DSP window; superior noise suppression but significant lag. |
| **DEMA** | 4 | 9 | 3 | 6 | Lag-canceling subtraction ⇒ structure distortion + overshoot risk. |
| **DWMA** | 7 | 2 | 10 | 10 | Ultra-smooth, but smears structure heavily (lag dominates). |