当随机化不可行时,匹配方法可以是一个强大的工具。
"Matching methods can be a powerful tool when randomization is not possible."
The only real mistake is the one from which we learn nothing.
The ocean's resilience is remarkable, but it is not limitless.
我总是试图在我的画中加入一点幽默,因为我认为这会让它们更有趣。