xxwywzy

Got it ! Thank you very much for the explanation！I think I have to learn more about the backdoor criteria :)

I have a new question about this notebook. The estimation result is a negative number (nearly -0.33). The notebook says that it means if the probability of cancellation was 0

我也是在自定义的dialog中点击按钮弹出PickerView时被DIalog遮挡住了，但我用了setDecorView并没有效果/(ㄒoㄒ)/~~

而且我认为下标应该从 i+1 开始，参考 https://www.jianshu.com/p/8d41d87fcbb7