How to use the rdtools.soiling.soiling_srr function in rdtools

def srr_soiling(aggregated, aggregated_insolation, **kwargs):
    if aggregated.index.freq != 'D' or \
       aggregated_insolation.index.freq != 'D':
        raise ValueError(
            'Soiling SRR analysis requires daily aggregation.'
        )

    sr, sr_ci, soiling_info = soiling.soiling_srr(
        aggregated, aggregated_insolation,
        **kwargs
    )
    srr_results = {
        'p50_sratio': sr,
        'sratio_confidence_interval': sr_ci,
        'calc_info': soiling_info
    }
    return srr_results