stats_standard_deviation
(PECL stats >= 1.0.0)
stats_standard_deviation — Returns the standard deviation
Description
$a
, bool $sample
= false
): float
Returns the standard deviation of the values in a
.
Parameters
-
a
-
The array of data to find the standard deviation for. Note that all values of the array will be cast to float.
-
sample
-
Indicates if
a
represents a sample of the population; defaults tofalse
.
Return Values
Returns the standard deviation on success; false
on failure.
Errors/Exceptions
Raises an E_WARNING
when there are fewer than 2
values in a
.