def filter(self, *args, **kwargs):
        return self._filter_or_exclude(False, *args, **kwargs)
Observed information matrix
dataset/ETHPy150Open django/django/django/db/models/query.py/QuerySet.filter--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/statespace/mlemodel.py/MLEModel.observed_information_matrix