---
title: "standardDeviation(deltaDegreesOfFreedom:)"
framework: tabulardata
role: symbol
role_heading: Instance Method
path: "tabulardata/columnslice/standarddeviation(deltadegreesoffreedom:)-3d6vo"
---

# standardDeviation(deltaDegreesOfFreedom:)

Returns the standard deviation of the floating-point column slice’s elements, ignoring missing elements.

## Declaration

```swift
func standardDeviation(deltaDegreesOfFreedom: Int = 1) -> ColumnSlice<WrappedElement>.Element
```

## Parameters

- `deltaDegreesOfFreedom`: A nonnegative integer. The method calculates the standard deviation’s divisor by subtracting this parameter from the number of non-nil elements (n - deltaDegreesOfFreedom where n is the number of non-nil elements).

## Return Value

Return Value The standard deviation; otherwise, nil if there are fewer than deltaDegreesOfFreedom + 1 non-nil items in the column.

## See Also

### Getting Statistical Values

- [sum()](tabulardata/columnslice/sum().md)
- [min()](tabulardata/columnslice/min().md)
- [max()](tabulardata/columnslice/max().md)
- [mean()](tabulardata/columnslice/mean()-3inzf.md)
- [mean()](tabulardata/columnslice/mean()-7u3i0.md)
- [standardDeviation(deltaDegreesOfFreedom:)](tabulardata/columnslice/standarddeviation(deltadegreesoffreedom:)-1i05i.md)