def METHOD_NAME(self):   #TODO needed or not
    super(MyPareto, self).METHOD_NAME()
    extra_params_names = ['shape', 'loc', 'scale']
    self._set_extra_params_names(extra_params_names)
    #start_params needs to be attribute
    self.start_params = np.array([1.5, self.endog.min() - 1.5, 1.])