stats_standard_deviation
(PECL stats >= 1.0.0)
stats_standard_deviation — Returns the standard deviation
参数
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
.
返回值
Returns the standard deviation on success; false
on failure.
错误/异常
Raises an E_WARNING
when there are fewer than 2 values in a
.