用stata做probit回归,对几组数据做同样的回归,其他几组都成功了,只有一个返回如下错误:
. probit happiness F1 F2 sex age relative educate marriage
note: sex~=0 predicts success perfectly
sex dropped and 50 obs not used
note: age~=2 predicts success perfectly
age dropped and 15 obs not used
outcome = F1>4.14 predicts data perfectly
r(2000);
这是什么意思呢?求教!