PHP 5.6.0RC3 is available

stats_variance

(PECL stats >= 1.0.0)

stats_varianceReturns the population variance

Beschreibung

float stats_variance ( array $a [, bool $sample = false ] )
Warnung

Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verf├╝gung.

Parameter-Liste

a

sample

R├╝ckgabewerte

add a note add a note

User Contributed Notes 1 note

up
-1
Anonymous
5 years ago
This will return surprising values for most users, since the default of sample=false is rather unusual when speaking about variance.

Point is:
When using stats_variance($foo,TRUE) the sum is divided by n-1 while the default just divides it by n. So when you expect your variance to be lower you probable wanted to divide by n-1, therefore should set the second parameter =TRUE.
To Top