执行
*IV Probit - First Stage Coefficients
xi: ivprobit emp_m $control_m (age_gap = fine) if _est_bench == 1, twostep first
然后就出现
. *IV Probit
. eststo ivprobit: xi: ivprobit emp_m $control_m (age_gap = fine) if _est_bench == 1,
> cluster(wave_t1_m_group)
i.birth_order _Ibirth_ord_1-4 (naturally coded; _Ibirth_ord_1 omitted)
i.wave _Iwave_1989-2011 (naturally coded; _Iwave_1989 omitted)
i.t1_m _It1_m_11-55 (naturally coded; _It1_m_11 omitted)
option cluster(wave_t1_m_group) not allowed