It was a randomized control study published in The Lancet.

Run Randomized Slide Show

This was a randomized trial.

So experimentalists use randomized experiments.

So what I'm going to do in this first lecture is just talk about the difference between a randomized experiment and an observational study.

Study, study!

Similarly, using a randomized control trial in rural Pakistan,

learning. Randomized decision trees, another technique from machine learning.

Last segment we talked about the power of randomized experiments.

like, and it almost looks like a randomized experiment, right?

So in this first segment, let's talk about randomized experiments.

Now we know they are effective because of randomized experiments.

Is again to drive home the power of those randomized experiments.

So we'll start out with two examples of randomized controlled experiments.

Study!

This study is my father's study.

And you can do the same randomized, controlled trial for social policy.

So that's why these observational studies aren't as powerful as randomized experiments.

The first, I'll give you a couple of examples of randomized experiments.

I don't have time to be writing emails. It's study, study, study!

We had to study from study books.

Novocure conducted its first phase three randomized trial in patients with recurrent GBM.

Don't study.

Study hard.

Study hard.

Study hall?

Study abroad?

Sterling study.

Let's study!

I study math harder than I study English.

But they lack the power of randomized experiments, and I'd like to show you.

Without randomized experiments, without random assignment to conditions, we can never really be sure.

I study math more seriously than I study English.

Tom did study, but he didn't study very much.

Study after study is coming to the same conclusion.

Study the Bible

Study The Quran

You study English.

You study English.

Let's study English.

Let's study French.

We study French.

I will study.

I study sometimes!

They study industry.