@property
    def param_names(self):
        """
        (list of str) List of human readable parameter names (for parameters
        actually included in the model).
        """
        if hasattr(self, '_param_names'):
            return self._param_names
        else:
            try:
                names = ['param.%d' % i for i in range(len(self.start_params))]
            except __HOLE__:
                names = []
            return names
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/statespace/mlemodel.py/MLEModel.param_names