

def _validate(start, k_ar, k_diff, dates, method):
    if isinstance(start, (string_types, datetime)):
        start = _index_date(start, dates)
        start -= k_diff
    if (('mle' not in method) and (start < (k_diff - k_diff))):
        raise ValueError(('Start must be >= k_ar for conditional MLE or dynamic forecast. Got %s' % start))
    return start

dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/arima_model.py _validate/VarMisuse@59/74 `k_ar`->`k_diff`