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lib/numerics/change/Change.md
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# CHANGE: Relative Price Change
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Numeric |
| **Inputs** | Source (close) |
| **Parameters** | `period` (default 1) |
| **Outputs** | Single series (Change) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period + 1` bars |
### TL;DR
- CHANGE calculates the percentage change between the current value and a value N periods ago.
- Parameterized by `period` (default 1).
- Output range: Varies (see docs).
- Requires `period + 1` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "The simplest measure of movement is often the most powerful."
CHANGE calculates the percentage change between the current value and a value N periods ago. This fundamental indicator forms the basis for momentum analysis, rate of change calculations, and relative performance comparisons.