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
(PECL stats >= 1.0.0)
stats_dens_normal — Probability density function of the normal distribution
$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.
xThe value at which the probability density is calculated
aveThe mean of the distribution
stdevThe standard deviation of the distribution
The probability density at x or FALSE for failure.
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
$stdev as deviation
There's a way to try it out:
<?php
...
echo"<pre>\n";
for($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
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.