PHP 7.4.0 alpha 2 Released

stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normal正規分布の確率密度関数

説明

stats_dens_normal ( float $x , float $ave , float $stdev ) : float

平均 ave, 標準偏差 stdev の正規分布にしたがう確率変数の x における確率密度を返します。

パラメータ

x

確率変数の値

ave

平均

stdev

標準偏差

返り値

x における確率密度。失敗時は FALSE を返します。

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User Contributed Notes 3 notes

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0
Hector
13 days ago
This functions will be the equivalent for "DISTR.NORM.N" on excel, like an other user said it's for Gaussian normal distribution.

$x as value to analyze
$ave as average
$stdev as deviation
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0
Anonymous
10 years ago
I'm not certain that I've figured this one out correctly but it should return the value of a (Gaussian) normal distribution of the given properties at the given location.
$x - the X-Value to request
$ave - the 'expected value' (i.e. location of the peak) for the distribution. For most uses this will just be 0.
$stdev - the standard deviation of the distribution. For most uses this will be 1.
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-3
Anonymous
9 years ago
There's a way to try it out:

<?php
...
echo
"<pre>\n";
for(
$x=-2;$x<=2;$x+=0.1){
  echo
"$i; ".stats_dens_normal($x,1,1)."\n";
}
echo
"</pre>\n";
?>

Observe the result (to determine yourself), or
save it as "stats_dens_normal.csv",
load it into Open Office and make a graph of it
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