stats_standard_deviation
Returns the standard deviation
Description
float stats_standard_deviation(array $a
, bool $sample
= false
)
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 to false
.
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
.