Function cpcv_path_count

crates/openquant/src/backtesting_engine.rs:178–182

(n_groups: usize, test_groups: usize)

}

pub fn cpcv_path_count(n_groups: usize, test_groups: usize) -> Result<usize, String> {
    validate_cpcv_params(n_groups, test_groups)?;
    let total = n_choose_k(n_groups, test_groups)?;
    Ok((total * test_groups) / n_groups)
}

pub fn run_walk_forward<E>(
    data: &BacktestData,