standardDeviation(deltaDegreesOfFreedom:)

Declaration

func standardDeviation(deltaDegreesOfFreedom: Int = 1) -> Double?

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

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

See Also

Getting Statistical Values

• sum()
• min()
• max()
• mean()
• mean()
• standardDeviation(deltaDegreesOfFreedom:)