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lib/statistics/stddev/StdDev.md
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# STDDEV: Standard Deviation
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Statistic |
| **Inputs** | Source (close) |
| **Parameters** | `period`, `isPopulation` (default false) |
| **Outputs** | Single series (StdDev) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period` bars |
### TL;DR
- Standard Deviation measures the amount of variation or dispersion of a set of values.
- Parameterized by `period`, `ispopulation` (default false).
- Output range: Varies (see docs).
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "Volatility is not risk, but it's the only thing we can measure."
Standard Deviation measures the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range.