stats_stat_powersum
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.
stats_variance
(PECL stats >= 1.0.0)
stats_variance — 母分散を返す
説明
float stats_variance
( array
$a
[, bool $sample = false
] )警告
この関数は、 現在のところ詳細な情報はありません。引数のリストのみが 記述されています。
パラメータ
-
a -
-
sample -
返り値
add a note
User Contributed Notes
stats_variance - [1 notes]
Anonymous ¶
4 years ago