Standard Deviation

What it does

Measures the dispersion (σ) of the source over the lookback. Higher = more volatile.

What happens

Recomputed once per candle from its wired source, incrementally (constant work per bar). It emits no value until the warmup period has passed; after that it produces a value every bar.

When to use

Volatility gating, or building your own bands around a moving average.

Gotchas

• Units match the source, so it isn't directly comparable across instruments.