biprobit换成cmp的格式运行,比较两者结果
用以下命令回归出来直接结果一致,但是边际结果不同,请问是什么原理呢?
. gen byte anykids = kids > 0
. biprobit (anykids = fem_inc male_educ) (fem_work = male_educ)
. margins, dydx(fem_inc) predict(p11)
. cmp (anykids = fem_inc male_educ) (fem_work = male_educ), ind($cmp_probit
$cmp_probit)
. preserve
. replace anykids=1
. replace fem_work=1
. margins, dydx(fem_inc) expression(exp(predict(lnl))) force