Modern Math VariancePopulation

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VariancePopulation

Returns the population variance of an array, dividing by n.

Syntax

VariancePopulation( byref a as Array( of T ) ) as float64

Notes

• Use it when the array is the entire population rather than a sample of one.
• Variance is the n-1 form and is the right default for measured data.
• Always smaller than the sample variance, by a factor of (n-1)/n.

Examples

#import "std/numeric"
#import "std/containers"
using numeric
using containers

dim as Array( of float64 ) a = { 2.0, 4.0, 4.0, 4.0, 6.0 }

print VariancePopulation( a ) '' 1.6
print Variance( a )           '' 2

print VariancePopulation( a ) < Variance( a )   '' -1 (true)

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Library: Math Library
Category: Math Library
Documented under: Members