The Law of Iterated Expectations: an introduction

This video provides some intuition behind the law of iterated expectations.

[LaPeauDeChagrin]

Pray the lord ! After crying on Wooldridge and Cameron, I saw the light in just 4:25 min !
Thanks a lot for your work

[thixie]

Thanks for all of these very helpful videos. Calm and clear explanation! The internet needs more great people like you. 

[nitameha]

Thank you very much. I was studying policy and impact evaluation in Switzerland, and it was hard to understand this Law.
now, with your explanation it's clear.
I hope it helps me for the exam :D

[johncharles]

So easy to understand when you explain it. Thanks man!

[mihaililiev]

So just a weighted average of sub-populations, said in a fancy way!? That's how I got it. Thanks for explaining it in simple terms!

[ZiyiZhang-bj]

Nice explanation! Better than my college lecturer!🎉😂

[xinglinli]

Finally get the intuition behind it, thank you so much

[maryamzolnoori]

Awesome work, Ben. We appreciate you.

[jacobm]

Brillian work, Ben. We appreciate you!

[ishitadeb]

thank you so much, now the concept is much clearer

[luisvictoria]

I don't understand the very last bit, aren't you supposed to take a second expectation of both male and female populations after summing their expectations together?

[inchicago]

At around 2:48 you say that taking an expectation of an expectation is essentially summing over all the values which the variable sex can take on. Is it really though? Isn't it more accurate to say that it's summing over all the values which E[IQ | Sex] can take on (by the definition of expectation). It appears you are missing a crucial step and I don't want to immediately accept that that it is just the same as summing over all the values for which sex can take on.

[JarJarBings]

That is a beautiful explanation. But I did not understand why E(E(X/Y)) has to be the sum of Y's.

[jordanjohnson]

That was an absolutely beautiful explanation. Thank you!

[yb]

Thanks for your video, clear explanation.

[tamarragurrieri]

You are the genius, thank you so muccch

[rodrigo]

Great explanation! Thank you very much!

[aidanabregov]

I hate that I didn't find this sooner!

[BlackIcexxi]

tehe
he said sex


all kidding aside thanks for this video it saved my butt