Vocabulary
math.statistics

Inputs and outputs

seq	a sequence
x	a non-negative real number

Word description
Computes the variance of seq. It's a measurement of the spread of values in a sequence. The larger the variance, the larger the distance of values from the mean.

Notes
If the number of elements in seq is 1 or less, it outputs 0.

Examples

USING: math.statistics prettyprint ; { 1 } var .
0

USING: math.statistics prettyprint ; { 1 2 3 } var .
1

USING: math.statistics prettyprint ; { 1 2 3 4 } var .
1+2/3

See also
population-var, sample-var

Definition

IN: math.statistics

ALIAS: var sample-var inline