arpoon.rfixest.FixestDID.did_means(fml: str = '.', treat_var: str | bool = True, post_var: str | bool = False, tex: bool = False, treat_dict: dict = None, dict_: dict = None, file: str = None, replace: bool = False, title: str = None, label: str = None, raw: bool = False, indiv: str | bool = True, treat_first=None, prepostnames: list = None, diff_inv: bool = False)