Statistic 函数
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stats_variance

(PECL stats >= 1.0.0)

stats_varianceReturns the population variance

说明

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

本函数还未编写文档,仅有参数列表。

参数

a

sample

返回值


Statistic 函数
在线手册:中文  英文

用户评论:

Anonymous (2009-02-27 13:43:58)

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.

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