# stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normalProbability density function of the normal distribution

### Описание

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

Returns the probability density at x, where the random variable follows the normal distribution of which the mean is ave and the standard deviation is stdev.

### Список параметров

x

The value at which the probability density is calculated

ave

The mean of the distribution

stdev

The standard deviation of the distribution

### Возвращаемые значения

The probability density at x or false for failure.

### User Contributed Notes 3 notes

Hector
1 year 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
Anonymous
11 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.
-3
Anonymous
11 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