"""
Placeholder implementations for statistical test functions that need to be implemented.
"""

from typing import List, Tuple, Any, Optional, Dict, Callable, Union, Sequence
import pandas as pd
import numpy as np  









def order_gene_ids(
    df: pd.DataFrame,
    col4zscore: str,


) -> pd.DataFrame:
    """
    Order gene IDs by Z-score.

    Args:
        df: DataFrame containing at least columns [col4zscore].
        col4zscore: Column name for Z-score.

    Returns:
        DataFrame with gene IDs ordered by Z-score.
    """
    raise NotImplementedError





