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Miha Kralj
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# MAPD: Mean Absolute Percentage Deviation
# MAPD: Mean Absolute Percentage Deviation
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Error Metric |
| **Inputs** | Source (close) |
| **Parameters** | `period` |
| **Outputs** | Single series (MAPD) |
| **Output range** | $\geq 0$ |
| **Warmup** | 1 bar |
### TL;DR
- Mean Absolute Percentage Deviation (MAPD) measures the average absolute percentage difference between actual and predicted values, using the predic...
- Parameterized by `period`.
- Output range: $\geq 0$.
- Requires 1 bar of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "Like MAPE, but divides by what you predicted instead of what actually happened."