'Provide something sane to print.'

def __repr__(self):

    rpr = 'KernelReg    instance\n'
    rpr += (('Number    of    variables:    k_vars    =    ' + str(self.k_vars)) + '\n')
    rpr += (('Number    of    samples:            N    =    ' + str(self.nobs)) + '\n')
    rpr += (('Variable    types:                        ' + self.var_type) + '\n')
    rpr += (('BW    selection    method:    ' + self._bw_method) + '\n')
    rpr += (('Estimator    type:    ' + self.reg_type) + '\n')
    return rpr
