eegprep.std_getindvar# eegprep.std_getindvar(STUDY, mode='both', scandesign=False)# Return STUDY factor names, values, subject groupings, and pairing flags. Parameters: STUDY (dict[str, Any]) mode (str) scandesign (bool | int) Return type: tuple[list[str], list[list[Any]], list[list[list[Any]]], list[str]]