model.py 文件源码

def _validate_inputs(self):
        x, z = self._x, self._z
        if x.shape[1] == 0:
            raise ValueError('Model must contain at least one regressor.')
        if self.instruments.shape[1] < self.endog.shape[1]:
            raise ValueError('The number of instruments ({0}) must be at least '
                             'as large as the number of endogenous regressors'
                             ' ({1}).'.format(self.instruments.shape[1],
                                              self.endog.shape[1]))
        if matrix_rank(x) < x.shape[1]:
            raise ValueError('regressors [exog endog] do not have full '
                             'column rank')
        if matrix_rank(z) < z.shape[1]:
            raise ValueError('instruments [exog instruments]  do not have '
                             'full column rank')
        self._has_constant, self._const_loc = has_constant(x)