variance

Calculates the sample variance of an array of numbers.

Syntax

variance(numbers: number[]): number

Parameters

Name	Type	Description
numbers	number[]	Array of numbers to calculate variance.

Return

Type	Description
number	The sample variance of the values.

Example

variance([2, 4, 4, 4, 5, 5, 7, 9]); // 4
variance([1, 2, 3, 4, 5]); // 2.5

Notes

• Throws TypeError if the argument is not an array of numbers.
• Returns NaN for an empty array.
• Uses the sample variance formula.

References

• Wikipedia: Variance