Function median 

pub fn median(values: &[f64]) -> f64

Compute median of a slice.

For even-length slices, returns the average of the two middle values.

Example

use codec_eval::stats::median;

assert_eq!(median(&[1.0, 2.0, 3.0, 4.0, 5.0]), 3.0);
assert_eq!(median(&[1.0, 2.0, 3.0, 4.0]), 2.5);