Joe Blitzstein Profile
Joe Blitzstein

@stat110

17,663
Followers
5,089
Following
110
Media
5,000
Statuses

Statistics professor at Harvard; statistician and data scientist; probability and paradoxes; Bayesian frequentist reconciliation; chess.

Cambridge, MA
Joined August 2010
Don't wanna be here? Send us removal request.
Pinned Tweet
@stat110
Joe Blitzstein
6 years
New edition of my probability book with Jessica Hwang is out! Read it FREE online at
Tweet media one
54
569
2K
@stat110
Joe Blitzstein
9 years
Major update to the #probability cheatsheet! More visual, new material: http://t.co/YoqOMEbYiv CC @wzchen #stat110 http://t.co/Vx7nDjrzZ6
Tweet media one
9
473
735
@stat110
Joe Blitzstein
6 years
Student: I have no idea how to do this problem. Me: Did you try some simple and extreme examples? Student: No, I don't have time to try that. Me: You don't have time NOT to try that.
2
56
377
@stat110
Joe Blitzstein
4 years
There's no such thing as a "quick question" in statistics.
5
26
271
@stat110
Joe Blitzstein
5 years
The probability of being killed given that one encounters a shark is not the same as the probability that a shark did it given that one is killed. See
@BillGates
Bill Gates
5 years
Why I would rather encounter a shark in the wild than a mosquito: #MosquitoWeek
Tweet media one
454
1K
6K
2
48
192
@stat110
Joe Blitzstein
4 years
YAY!!! So much joy and relief after 4 nightmarish years of a racist, sexist, xenophobic, anti-science, authoritarian, mendacious, narcissistic, corrupt sociopath as president. A huge amount needs to be fixed and improved, but at least there is a restoration of decency.
1
12
188
@stat110
Joe Blitzstein
6 years
Probability as you’ve never tasted it. Be our guest for #stat110x (vegetarians welcome too). Starts next Thursday!
Tweet media one
5
55
167
@stat110
Joe Blitzstein
7 years
The Stat dept here is 60 years old. We had more Stat majors graduate this year than in the first 50 years combined.
3
44
165
@stat110
Joe Blitzstein
2 years
I'm grateful that so many students want to learn probability with me (Stat 110 is undergrad level, 210 is grad level)! But I'm also relieved to have fallen short of 900 students total, mindful of the old saying, "When 900 students you reach, look as good, you will not."
Tweet media one
9
5
159
@stat110
Joe Blitzstein
4 years
I support @daniela_witten that @AmstatNews Fisher Lecture be renamed. Fisher was a virulent racist and eugenicist. Hard in this context to fully separate his scientific ideas from his personal ideas; he was even a PROFESSOR OF EUGENICS! Shouldn’t be honored as a hero of the field
3
23
152
@stat110
Joe Blitzstein
6 years
Thank you Batman for giving a guest lecture in Stat 110 today! (He was returning a favor since I helped him solve some treacherous probability puzzles that the Riddler had posed him.)
Tweet media one
4
19
149
@stat110
Joe Blitzstein
6 years
by @SherlockpHolmes and @wolfgangkhuber is one of the most beautiful and useful statistics books I've ever seen. And I don't even work on biology (thought I want to learn more). Conflict of interest disclosure: Susan was one of my mentors at Stanford.
2
51
141
@stat110
Joe Blitzstein
6 years
I was thinking of making an audiobook version of my probability book, until coming across this...
Tweet media one
6
22
140
@stat110
Joe Blitzstein
6 years
Looking forward to teaching statistical inference with Susan Murphy this spring! But there's no book we're excited about using. Too many are full of context-free problems like "Consider the model f_theta(y) = blah. Find the MLE of theta." Do you have cool examples to suggest?
10
25
120
@stat110
Joe Blitzstein
4 years
I had 92 students attend my Zoom office hours tonight... definitely one advantage of online, considering that I can barely fit 6 students in my physical office, even without social distancing!
2
4
111
@stat110
Joe Blitzstein
4 years
Last night I dreamed that I got to meet @Lin_Manuel , and we were excited to collaborate on a musical about the life of a statistician. First sweet dream I can remember having in this nightmarish year. Hoping so much for some good news in 3 days...
5
2
109
@stat110
Joe Blitzstein
6 years
Got a bit too excited in class explaining an example with P(A|B,C) where A is the event that there is a fire, until I realized that shouting “fire” in a crowded lecture hall is not the best idea.
4
5
106
@stat110
Joe Blitzstein
5 years
I taught John Snow's work on cholera in Stat 111 a few days ago, to show the importance of data quality and causal inference. Couldn't resist saying that people around him thought he was crazy for thinking cholera was waterborne, that they said "You know nothing, John Snow."
1
15
104
@stat110
Joe Blitzstein
6 years
Big picture for my course with Susan Murphy and (when not on sabbatical) @shephard_neil . Prediction and causal inference are center stage, along with classical statistical inference. Probability, randomization, computing, and Bayesian and frequentist thinking come together!
Tweet media one
3
23
105
@stat110
Joe Blitzstein
8 years
R.I.P. Raymond Smullyan, incredible logician, philosopher, puzzle writer, magician, pianist, author. Here's my collection of Smullyan books.
Tweet media one
2
36
97
@stat110
Joe Blitzstein
6 years
Conditional expectation in 6 minutes. With stacked water bottle charts, and two of the most useful identities in all of statistics! #stat110x
Tweet media one
1
33
95
@stat110
Joe Blitzstein
7 years
Stat 110 (Probability) has 579 students this semester. Third biggest course at Harvard this semester, after @cs50 and Ec 10. Should be fun.
6
10
91
@stat110
Joe Blitzstein
4 years
This is evil and unconscionable
@ReichlinMelnick
Aaron Reichlin-Melnick
4 years
This is bad. ICE just told students here on student visas that if their school is going online-only this fall, the students must depart the United States and cannot remain through the fall semester.
Tweet media one
3K
64K
81K
1
11
84
@stat110
Joe Blitzstein
3 years
I read the horrifying 65 page filing Brave, credible, and devastatingly important — and shows utterly vile conduct by Comaroff for years, and systemically broken investigatory processes at Harvard (slow, incompetent, and failing to protect victims).
1
8
81
@stat110
Joe Blitzstein
6 years
Video of the Pickard Lecture by @minebocek is now online! A wonderful talk, with lots of food for thought about course design and teaching statistics and data science.
3
27
74
@stat110
Joe Blitzstein
5 years
@askdrstats @BaumerBen @AmeliaMN @jo_hardin47 @StatGarrett @minebocek @MineDogucu @hglanz @jtleek @rafalab @JennyBryan Less: ways of computing p-values, hypothesis testing, fuss over whether to divide by n or n-1 in sample var, tedious calculations More: thinking about data quality, sampling, likelihood, bias-variance tradeoff, simulation, visualization, discussion of common misconceptions
1
5
76
@stat110
Joe Blitzstein
1 year
My colleague Herman Chernoff is turning 100 this year! We're having a centennial celebration on May 5 at Harvard: Hope to see a lot of you there!
1
12
74
@stat110
Joe Blitzstein
6 years
Statisticians are called weird for terms like Law of the Unconscious Statistician (LOTUS), but I just heard that actuaries use "Darth Vader Rule" for the fact that the expectation of a nonnegative r.v. is the integral of its survival function.
Tweet media one
4
23
73
@stat110
Joe Blitzstein
4 years
The 19 is easy to explain. What's hard to explain is how a racist, misogynistic, idiotic sociopath became President of the United States.
@Acyn
Acyn
4 years
The President uses the term “Kung Flu” again and says “COVID, COVID-19, COVID, I said what’s the 19. COVID-19, some people can’t explain the 19.”
8K
4K
13K
3
6
68
@stat110
Joe Blitzstein
6 years
Welcome to Bayesville, population 2000. #soulofstatistics #stat110x
Tweet media one
2
23
72
@stat110
Joe Blitzstein
3 years
Awwww, thanks so much @zacharylipton ! I'm not sure it is worth the risk to the space-time continuum, but happy to trade with you some probability and inference knowledge for some help with understanding deep learning. :)
@zacharylipton
Zachary Lipton
3 years
I want to go back in time to take undergrad probability & statistical inference from @stat110 . Check out his wildly popular videos on probability: & his charismatic textbook:
7
26
289
3
4
69
@stat110
Joe Blitzstein
4 years
Trump at debate in 2016, on whether he would accept result of the election: "I'll keep you in suspense." Trump today: won't accept result of the election, says to the domestic terrorists he incited "We love you. You're very special." But keep in mind Clinton used private email.
0
1
64
@stat110
Joe Blitzstein
5 years
Xiao-Li Meng, one of the deepest thinkers and most inspiring people I know, is (at long last) on Twitter! @XiaoLiMeng1
@XiaoLiMeng1
Xiao-Li Meng
5 years
Stats + Stories: Introducing The Harvard Data Science Review
2
9
69
2
11
62
@stat110
Joe Blitzstein
4 years
Often the best way to resolve a problem is to re-solve it.
2
6
63
@stat110
Joe Blitzstein
4 years
I'm not a legal expert... can Biden simply "hereby claim" Michigan to counter Trump's "hereby claim"? If both assert "hereby claims", is there some system in place for determining who gets Michigan's electoral votes?
11
1
58
@stat110
Joe Blitzstein
13 years
My probability course Stat 110 is now on iTunes U, w/ 34 lecture videos and 250 problems w/ solutions! http://t.co/JyaoAAYz
3
24
60
@stat110
Joe Blitzstein
5 years
@economeager Yep, they seem like they should be mostly harmless but they're very treacherous! Check out Larry Wasserman's post "Mixture Models: The Twilight Zone of Statistics" (great title!) and this paper by @AviFeller , Greif, Miratrix, Pillai
2
6
53
@stat110
Joe Blitzstein
6 years
The entire Statland saga in one handy playlist: story proofs, P(A|B) vs. P(B|A), discrete distributions, interplay between discrete & continuous, expectation and linearity, conditional expectation, and Markov chains, animated in about 5 min each! #stat110x
1
17
56
@stat110
Joe Blitzstein
4 years
@medburnbook Data, randomness, uncertainty are everywhere.
0
3
51
@stat110
Joe Blitzstein
10 years
Stat 110: The Book is now out! http://t.co/oALVxkunW6 Currently 20% off. Probability, R, MCMC, paradoxes, treasure maps,.... @CRC_MathStats
10
29
50
@stat110
Joe Blitzstein
10 years
“It is easy to lie with statistics, but easier to lie without them.” - Fred Mosteller #StatQuotes
2
77
51
@stat110
Joe Blitzstein
7 years
@ReginaNuzzo How could it not be a "sample of statisticians"?
3
4
49
@stat110
Joe Blitzstein
4 years
RIP Alex Trebek, my favorite game show host of all time (along with Monty Hall)
0
0
48
@stat110
Joe Blitzstein
5 years
Congratulations @BaumerBen on the 2019 Outstanding Undergraduate Teaching Award from the Boston Chapter of the ASA! He is giving a talk "The New Roaring Twenties: Imagining statistics and data science curricula in the coming decade" at Harvard on Oct 7:
1
12
45
@stat110
Joe Blitzstein
5 years
@RodrigoRivr @zacharylipton @larrywasserman Thanks Rodrigo! There is a free online version and many resources via
0
2
47
@stat110
Joe Blitzstein
4 years
@seanjtaylor Bayes' rule (extremely simple proof, extremely deep consequences), Stein's paradox (extremely clever proofs, extremely deep consequences)
2
2
43
@stat110
Joe Blitzstein
6 years
Free tours of Statland begin today! Five cities, plus river and aerial excursions. Thank you to @edXOnline @HarvardOnline @CRC_MathStats @Harvard for support. #probability #stat110x
Tweet media one
2
17
46
@stat110
Joe Blitzstein
4 years
Charles Murray promotes racist pseudoscience, not data science. For data science it is essential to think about data quality, potential biases in the data, and data ethics.
2
3
41
@stat110
Joe Blitzstein
11 years
My probability course Stat 110 at @Harvard is now on youtube at #probability #statistics
2
24
43
@stat110
Joe Blitzstein
4 years
I always liked Mosteller's quote "It is easy to lie with statistics; it is easier to lie without statistics." But Trump's thousands of lies give many counterexamples: he lies with equal ease both with statistics and without statistics.
@atrupar
Aaron Rupar
4 years
Trump explains that the US coronavirus numbers are actually good -- if you take out the hardest hit states
86
210
762
3
4
40
@stat110
Joe Blitzstein
7 years
Fundamental theorem of the reproducibility crisis: N = $ you have / $ per sample -- @jtleek #JSM2017
1
24
44
@stat110
Joe Blitzstein
3 years
@Harvard needs to allow a 3rd party grievance procedure and to completely rethink how such cases are handled (and not just create some new committee that will spend years debating what went wrong here and then issue a report that will mostly be ignored).
1
10
41
@stat110
Joe Blitzstein
4 years
@willemsleegers Which do you care about more, sample variance or sample SD? As soon as you take the sqrt of the unbiased sample var it will be biased anyway (by Jensen). Also, for Normal data, dividing by n-1 is unbiased, dividing by n is the MLE, but dividing by n+1 is optimal (w.r.t. MSE)!
3
1
35
@stat110
Joe Blitzstein
6 years
View from just outside my office
Tweet media one
1
1
41
@stat110
Joe Blitzstein
6 years
Visual interpretation of Universality of the Uniform (a.k.a. the Probability Integral Transform) by @brianczhang : Brian made this 5 years ago as a Stat 110 TA, but students are still finding it useful!
1
8
37
@stat110
Joe Blitzstein
6 years
@StuartBuck1 They call it an "example", but it is a horrible example. And doesn't make sense, how are the terms partitioned up? I was surprised to see data science on the "easy to learn" side, but guess that assumes the "hard to learn" subjects of math, statistics, ML are excluded from DS...
1
1
37
@stat110
Joe Blitzstein
6 years
I enjoyed #JSM2010 in Vancouver, but made the mistake of almost never leaving the convention center except to go to the hotel. Rectifying that at #JSM2018 . Just went to Capilano Suspension Bridge Park, which was amazing! Highly recommended (unless you’re very afraid of heights)
4
2
38
@stat110
Joe Blitzstein
4 years
@Notawful I think it's just because a hundred years ago Student (Gosset) and Fisher happened to use the notation z for what is now called a z statistic, and likewise for t and the t statistic. Statisticians are usually not great at naming things (the bootstrap is a notable counterexample).
1
0
32
@stat110
Joe Blitzstein
6 years
Looking forward to the David K. Pickard Memorial Lecture by @minebocek this Friday, on data science course design and pedagogy! Title, abstract, and more information at: If you are in the Boston area, you are welcome to attend!
1
8
35
@stat110
Joe Blitzstein
5 years
One of my favorite books ever. Congratulations Aki on finishing this!
0
1
35
@stat110
Joe Blitzstein
4 years
RIP to my friend and @Harvard colleague Prof. Rob Lue, a visionary not only in biology education but also in the interface of science & art in his leadership at @DerekBokCenter @HarvardOnline @TheHDSR & more. Check out his Inner Life of the Cell animation
2
4
35
@stat110
Joe Blitzstein
3 years
@ben_golub There are some fun ones in
1
0
34
@stat110
Joe Blitzstein
3 years
He needs to be fired, for the massive harm he has done, to prevent him from doing more such harm, and to avoid sending the message that such conduct is acceptable. Tenure is meant to protect academic freedom, not to protect harassment and abuse.
1
3
34
@stat110
Joe Blitzstein
6 years
Welcome @shephard_neil to Twitter! Neil is Harvard's first ever joint Econ-Stat professor, a great financial econometrician, and has had a huge impact on statistics and data science at Harvard since arriving from Oxford 5 years ago.
1
5
36
@stat110
Joe Blitzstein
4 years
I enjoy the many insightful, funny, and insightful-and-funny tweets of @kareem_carr . Let’s support thoughtful, respectful discussion — terrible that there are so many racists, trolls, and racist trolls attacking him.
@kareem_carr
🔥Kareem Carr | Statistician 🔥
4 years
Thought it might be useful to collect screenshots of people who brought my race into the discussion of my thread even though I’m just talking about arithmetic. It helps to bring context to the underlying reasons for the objections to what I’m saying and who’s saying it.
Tweet media one
Tweet media two
Tweet media three
Tweet media four
41
68
528
1
3
35
@stat110
Joe Blitzstein
6 years
My favorite musical is Into the Woods. One of my favorite probability puzzles is the Monty Hall problem. Today I learned that Joanna Gleason, who played the Baker's Wife in the original Broadway production, is Monty Hall's daughter.
2
1
33
@stat110
Joe Blitzstein
5 years
@hadleywickham Congratulations Hadley! Extremely well-deserved, and a sign that the field is moving in the direction of "impact t he world by being useful" that you wrote about at
1
3
34
@stat110
Joe Blitzstein
6 years
Fireworks to end the penultimate day of #JSM2018 . This is the Disneyland of Stat conferences.
0
4
35
@stat110
Joe Blitzstein
11 years
The data science process: ask a question <-> get data <-> explore data <-> model data <-> communicate & visualize! http://t.co/tJPAGVfNku
Tweet media one
0
21
33
@stat110
Joe Blitzstein
4 years
@matt_blackwell iPad + Apple Pencil + Notability, with interaction from chat and breakout rooms: good Blazing through hundreds of PowerPoint slides on Zoom: bad
0
4
34
@stat110
Joe Blitzstein
5 years
@economeager Stigler gives some great intuition. On p. 150 he talks about why we need at least 3 observations.
2
2
30
@stat110
Joe Blitzstein
4 years
@stevenstrogatz Happy birthday! I hope the twin prime conjecture holds, so there is no theoretical upper bound to these happy milestones.
0
0
33
@stat110
Joe Blitzstein
6 years
The Efron-Morris baseball example of Stein's paradox and shrinkage, as in their wonderful Scientific American paper Beautiful, surprising, and useful at the same time.
2
2
30
@stat110
Joe Blitzstein
4 years
Disgusting and disgraceful; so sorry you experienced that. @Harvard needs to be much better about handling such cases, regardless of tenure
@JadeArchaeobot
Jade d'Alpoim Guedes 🇵🇹
4 years
This is the email I received from Gary Urton. I was a second to last year graduate student and he was chair at the time. Harvard, this time please don’t say there “ was no evidence for violation of policy”.
Tweet media one
564
4K
12K
0
6
30
@stat110
Joe Blitzstein
4 years
Didn’t sound tongue in cheek to me. But in any case, it’s either idiotic and cruel, or idiotic and deadly.
@jaketapper
Jake Tapper
4 years
Trump tonight: “When you do testing to that extent, you are gonna find more people, you’re gonna find more cases. So I said to my people: ‘Slow the testing down, please.’” Health officials say this is the exact opposite of what the US should be doing right now.
1K
11K
56K
3
2
29
@stat110
Joe Blitzstein
6 years
@ProbFact TWO proofs of this in one tweet: 1. MGF of Pois(a) plus indep Pois (b) is product of MGFs: exp(a(e^t-1))*exp(b(e^t-1))=exp((a+b)(e^t-1)), the Pois(a+b) MGF. 2. In a Poisson process of rate 1, # arrivals in (0,a+b) = # in (0,a) + # in [a,a+b) and # in (0,t) is Pois(t) for all t.
0
2
29
@stat110
Joe Blitzstein
7 years
Thank you @KLdivergence for your brave, important, and deeply disturbing post at . Horrific and shameful behavior, and the culture needs to change to prevent this from continuing to happen.
0
7
31
@stat110
Joe Blitzstein
3 years
@shephard_neil Until a few years ago, his office was across from mine and he came to the office almost every day! He even asked me questions about #rstats , in his 90s, since he was coding up some simulations.
0
1
29
@stat110
Joe Blitzstein
5 years
For an exploration of John Snow's work on the 1854 cholera epidemic in London, I recommend by @AlyssaAGoodman and @HarvardOnline .
3
4
28
@stat110
Joe Blitzstein
4 years
@kbarley66 The Cauchy-Schwarz Master Class (Steele), Applied Linear Algebra (Boyd and Vandenberghe) - free via , Enumerative Combinatorics (Stanley) - free version of Vol. 1 via , Concrete Mathematics (Graham, Knuth, Patashnik)
1
4
25
@stat110
Joe Blitzstein
4 years
@kareem_carr That's disgusting and absurd. Sorry you have to deal with abusive comments like that.
1
0
26
@stat110
Joe Blitzstein
5 years
One of my favorite books, congratulations @rlmcelreath on finishing the new edition!
@rlmcelreath
Richard McElreath 🦔
5 years
Statistical Rethinking 2nd edition, scheduled for March 2020. Here's a summary of changes, with table of contents at the bottom.
30
220
1K
0
3
27
@stat110
Joe Blitzstein
4 years
CDC Director: It would be “very disappointing” if schools use CDC reopening guidelines as guidelines for reopening. I mean, what did you think those reopening guidelines were? Guidelines for reopening or something?
1
4
27
@stat110
Joe Blitzstein
4 years
Looking forward to a short course by the amazing @minebocek on using R Shiny to build interactive web apps! If you'd like to join, you can sign up at
@BostonChapASA
Boston Chapter of the ASA
4 years
Short Course on the R package Shiny Instructor: Mine Çetinkaya-Rundel, Senior Lecturer, School of Mathematics, University of Edinburgh Date and Time: October 16th and October 23rd, 1-4pm Location: Virtual Registration:
0
3
15
1
3
27
@stat110
Joe Blitzstein
9 years
Powerful probability and puzzling paradoxes in Python: http://t.co/cBtwLKLBiG Great IPython notebook by Peter Norvig
0
17
28
@stat110
Joe Blitzstein
6 years
I've been accused of making up too many acronyms, but differentiation under the integral sign is so cool and useful that it really deserves one. So here it is: DUThIS (Differentiation Under The Integral Sign).
0
4
27
@stat110
Joe Blitzstein
6 years
Great materials from a survival analysis workshop by Dave Harrington: … Data sets that go along with the lectures and labs: … #rstats #survivalanalysis
0
5
27
@stat110
Joe Blitzstein
8 years
. @Amstat_Lara Here I am with 400 plushies. Thanks @NausicaaDist !
Tweet media one
2
4
24
@stat110
Joe Blitzstein
9 years
There couldn't be a more promising field than statistics in 2015, a combination of logic, philosophy, math, computation, and science! -Efron
1
18
26
@stat110
Joe Blitzstein
3 years
@shephard_neil Thanks Neil! I'm happy to be able to share the joys of probability, locally at @Harvard and globally via and my @HarvardOnline course
0
1
24
@stat110
Joe Blitzstein
5 years
@heyitsmehugo @minebocek @BecomingDataSci Check out Berger, "Could Fisher, Jeffreys and Neyman Have Agreed on Testing?" and Christensen, "Testing Fisher, Neyman, Pearson, and Bayes"
3
2
24
@stat110
Joe Blitzstein
4 years
The epic story of SVD. It is a crime that most linear algebra courses don’t cover it.
@WomenInStat
Women in Statistics and Data Science
4 years
So yesterday I asked you all what you wanted to hear about from me this week, and one answer stood out from all the others: the SINGULAR VALUE DECOMPOSITION (SVD). 1/
14
497
2K
0
4
24
@stat110
Joe Blitzstein
10 years
Post by @wzchen : The Only Probability Cheatsheet You'll Ever Need http://t.co/xs09hXGs4z
3
9
26
@stat110
Joe Blitzstein
7 years
And, for the first time, over 100 Statistics majors plus minors graduating this year.
0
1
25