'Provide something sane to print.'

def __repr__(self):

    repr = 'Semiparamatric    Partially    Linear    Model    \n'
    repr += (('Number    of    variables:    K    =    ' + str(self.K)) + '\n')
    repr += (('Number    of    samples:            N    =    ' + str(self.nobs)) + '\n')
    repr += (('Variable    types:                        ' + self.var_type) + '\n')
    repr += ('BW    selection    method:    cv_ls' + '\n')
    repr += ('Estimator    type:    local    constant' + '\n')
    return repr
