sample-var ( seq -- x )
Statistics

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Vocabulary
math.statistics

Inputs

seq	a sequence

Outputs

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.

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

Examples

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

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

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

See also
var-ddof, population-var

Definition

IN: math.statistics

: sample-var ( seq -- x ) 1 var-ddof ; inline