def METHOD_NAME(self):
    """Conversion method to Pandas DataFrame. To be attached to ResultDict.
    Returns
    -------
    main_effect, inter_effect: tuple
        A tuple of DataFrames for main effects and interaction effects.
        The second element (for interactions) will be `None` if not available.
    """
    names = self["names"]
    main_effect = self["ME"]
    interactions = self.get("IE", None)
    inter_effect = None
    if interactions:
        interaction_names = self.get("interaction_names")
        names = [name for name in names if not isinstance(name, list)]
        inter_effect = pd.DataFrame({"IE": interactions}, index=interaction_names)
    main_effect = pd.DataFrame({"ME": main_effect}, index=names)
    return main_effect, inter_effect