来自《耶鲁大学开放课程：心理学导论第20集第20集》

is you have to take people at the same point

对比数值相同情况下得到治疗
who would get treatment and compare them to people

和没得到治疗
who do not get treatment or what we call a "Control group."

或者称之为对照组的两拨人
And this is an example of this.

比如
So, this is for people who are depressed.

这是抑郁的人
This is statistically equal. They start off pre-therapy.

数据上都是对等的他们开始接受治疗
They all go for therapy but because in this example

他们都去接受治疗但在这个例子中
there's a limited number of therapists,

治疗师的人数有限
some of them are put on a waiting list

有些人需要等待
and others get a therapist.

其他人先接受治疗
It's arbitrary. It's random,

这是任意的随机的
which is--which--making it a very good experiment.

这就成了一个很棒的实验