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stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normal — Not documented

Опис

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

Увага

This function is currently not documented; only its argument list is available.

Параметри

x
ave
stdev

Значення, що повертаються

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User Contributed Notes 3 notes

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Hector ¶

4 years 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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Anonymous ¶

15 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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-7

Anonymous ¶

14 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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