def combined_adjusted_rate(adj_rate):
    """Combines the adjusted ASR calculated from RPC_adj_rate

    Parameters
    ----------
    adj_rate : List of series
        list of pd.Series containing the adj_rate per node/region

    Returns
    -------
    pd.core.frame.DataFrame
        Dataframe containing the combined values of the RPC_adj_rate
    """
    return sum([series.droplevel(0) for series in adj_rate])