def clean(self):
        """drop regularization and prior information observation from the jco
        """
        if self.pst_arg is None:
            self.logger.statement("linear_analysis.clean(): not pst object")
            return
        if not self.pst.estimation and self.pst.nprior > 0:
            self.drop_prior_information()
drop regularization and prior information observation from the jco