Function std_dev

crates/openquant/src/synthetic_backtesting.rs:377–388

(values: &[f64])

}

fn std_dev(values: &[f64]) -> f64 {
    if values.len() < 2 {
        return 0.0;
    }
    let mean = values.iter().sum::<f64>() / values.len() as f64;
    let mut ss = 0.0;
    for v in values {
        let d = *v - mean;
        ss += d * d;
    }
    (ss / (values.len() as f64 - 1.0)).sqrt()
}

fn median_sorted(sorted: &[f64]) -> f64 {
    let n = sorted.len();