# `Macaw.Data.Operations.Aggregates.Delta`
[🔗](https://github.com/dcoai/macaw_data/blob/v0.5.3/lib/macaw/data/operations/aggregates.ex#L477)

`delta`: the last reading minus the first (spec/04 §5).

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*Consult [api-reference.md](api-reference.md) for complete listing*