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lib/filters/cheby2/Cheby2.md
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# CHEBY2 (Chebyshev Type II / Inverse Chebyshev)
# CHEBY2 (Chebyshev Type II / Inverse Chebyshev)
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `period`, `attenuation` (default 5.0) |
| **Outputs** | Single series (Cheby2) |
| **Output range** | Tracks input |
| **Warmup** | `period` bars |
### TL;DR
- A Chebyshev Type II filter (also known as Inverse Chebyshev) with O(1) complexity.
- Parameterized by `period`, `attenuation` (default 5.0).
- Output range: Tracks input.
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
A Chebyshev Type II filter (also known as Inverse Chebyshev) with O(1) complexity. Unlike the Type I filter, Type II is maximally flat in the passband (like Butterworth) but has equiripple in the stopband.