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# stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normalProbability density function of the normal distribution

### Descrierea

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

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`.

### Parametri

`x`

The value at which the probability density is calculated

`ave`

The mean of the distribution

`stdev`

The standard deviation of the distribution

### Valorile întoarse

The probability density at `x` or `FALSE` for failure.

### User Contributed Notes 2 notes

Anonymous
8 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. ```
-2
Anonymous
8 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), orsave it as "stats_dens_normal.csv",load it into Open Office and make a graph of it ```