Function standard_deviation 

pub fn standard_deviation<T: AsRef<[f64]>>(values: T) -> f64

Calculate statistical standard deviation for values.

Return NaN if the values are empty.

Example

#[macro_use]
use numeric_statistics::assert_eq_f64;
use numeric_statistics::f64::standard_deviation::*;;
let values = &[1.0, 2.0, 4.0];
let standard_deviation = standard_deviation(values);
assert_eq_f64!(standard_deviation, 1.5275252316519465 as f64);