pub fn information_ratio(
asset_returns: &[f64],
benchmark_returns: &[f64],
) -> FinanceResult<f64>Expand description
Information ratio: mean(active) / stdev(active) where active[i] = asset[i] − benchmark[i].
Active returns and tracking error use the same sampling frequency as the inputs (not annualized). For desk IR, pass already-period-matched excess returns.