pub fn deviation(data: &[f64]) -> Option<f64>Expand description
Returns the sample standard deviation of values in the slice.
Uses Bessel’s correction (divides by n-1).
Returns None if the slice has fewer than 2 elements.
§Example
use d3rs::array::deviation;
let data = vec![2.0, 4.0, 4.0, 4.0, 5.0, 5.0, 7.0, 9.0];
let dev = deviation(&data).unwrap();
assert!((dev - 2.138089935299395).abs() < 1e-10);