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*用全部协变量生成IV
ivreg2h foodshare z_* (lrtotexp = ), robust
*用指定协变量生成IV
ivreg2h foodshare z_* (lrtotexp = ), robust z(z_age-z_twocars)
*用全部协变量生成IV,另加自己的IV
ivreg2h foodshare z_* (lrtotexp = lrinc), robust
*用指定协变量生成IV,另加自己的IV
ivreg2h foodshare z_* (lrtotexp = lrinc), robust z(z_age-z_twocars)
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