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Judea Pearl
@yudapearl
, 3 tweets, 1 min read Read on Twitter
1/2
 Dear readers and followers,
I noticed that our Twitter audience has swelled to over 15K, which prompts me to thank you for energizing me with your comments and questions and for giving me the illusion of being somewhat useful in this game of cause and effect.
2/3
 I have tried to keep my Tweeting focused on the science, minimizing foods,
cute pets and funny cartoons, yet entertaining enough to have you try causation's new tools that do what we used to think we can't. I hope I can continue this experiment and make
3/3
 and make Tweeting exchange a valuable learning experience. As they say in the Mishna (220 AD, anticipating Twitter): "Speak briefly and act fully"
[In Hebrew: "Emor Meat Veaseh Harbe"] #Bookofwhy
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Judea Pearl
@yudapearl
1/3
 You ask if there is a "shorter" #Bookofwhy, and I assume you want to get the technical meat w/o reading the stories. Yes, there is. If you take a look at Section 2 of ucla.in/2mhxKdO, you will find the whole book summarized in 3 pages. But it must be supplemented
2/3
 with the toy problems of Section 3. No matter how many books one reads ABOUT economics, shying away from solving toy problems would leave one where econometrics is today -- two decades behind the time. Plus, it is fun to see important methodological problems escaping their
3/3
 textbook handcuffs and rejoicing game-like solutions. I therefore recommend: do not skip the toy problems in ucla.in/2mhxKdO and their solutions. Try one - its better than reading a whole book. Among the easy ones: Can your research question be answered using OLS?
Read 3 tweets
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Judea Pearl
@yudapearl
1/3
 Your question: "why I wasn't taught the graphical approach" was raised by many economists on this Twitter, and I have partially answered it in ucla.in/2mhxKdO and ucla.in/2L8OCyl. Without going too deep into Psychology, the answer is "Not home grown!". (cont.
2/3
 Your second question: "Would I be [taught it] today" is tricky. @Susan_Athey says there is no need, because economists already have the answers. (see
According to others (eg @marcfbellemare, @PHuenermund @causalinf), economists are beginning to rebel
3/3
 against the tyranny of outdatedness. This workshop: why19.causalai.net will
provide an opportunity for both rebels and conformists to present their cases before Clio, the Muse of history. #Bookofwhy.
Read 3 tweets
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Judea Pearl
@yudapearl
1/3
 Causally speaking, it is the other way around. Those who "get it" cannot bring themselves to call mathematical analysis "design" or "thinking hard". Moreover, speaking of "implementation of these methods" sounds like there are "alternative methods". I do not see any; (cont.
2/3
 The choice is between doing thing systematically or retreating to the days of "thinking hard", namely, between survival and staying behind. At the same time, if you and others think that mild language would create more survivors, by all means, you have my blessing. But
3/3
 please do not ask me to call formal mathematical derivations "DESIGN", just because many people were educated in an era when these derivations had to be done by informal "thinking hard". Readers of #Bookofwhy will not forgive me, because they do "get it".
Read 3 tweets

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