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.