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Allen B. Downey

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Allen Downey is a Professor Emeritus at Olin College and the author of a series of freetextbooks related to software and data science, including Think Python, Think Bayes, and Think Complexity, which are also published by O’Reilly Media. His blog, Probably Overthinking It, features articles on Bayesian probability and statistics. He holds a Ph.D. in computer science from U.C. Berkeley, and M.S. and B.S. degrees from MIT.

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Allen B. Downey's Blog: Probably Overthinking It

Think DSP second edition

I have started work on a second edition of Think DSP! You can see the current draft here.

I started this project in part because of this announcement:

Once in a while, a few of the Scicloj friends will meet to learn about signal processing, following the Think DSP book by Allen B. Downey, and implementing things in Clojure. Our notes will be published at Clojure Civitas.

If you know some Clojure

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Allen B. Downey’s books

Average rating: 4.0 · 3,233 ratings · 388 reviews · 36 distinct works • Similar authors

	Think Python 4.13 avg rating — 1,664 ratings — 57 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think Stats 3.64 avg rating — 467 ratings — published 2011 — 27 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think Bayes: Bayesian Statistics in Python 3.94 avg rating — 284 ratings — published 2012 — 14 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think Complexity: Complexity Science and Computational Modeling 3.91 avg rating — 245 ratings — published 2009 — 13 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think Java: How to Think Like a Computer Scientist 3.91 avg rating — 169 ratings — published 2016 — 19 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Probably Overthinking It: How to Use Data to Answer Questions, Avoid Statistical Traps, and Make Better Decisions 4.21 avg rating — 86 ratings	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	The Little Book of Semaphores: The Ins and Outs of Concurrency Control and Common Mistakes 4.39 avg rating — 80 ratings — published 2009	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think DSP: Digital Signal Processing in Python 4.02 avg rating — 44 ratings — 4 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think Data Structures: Algorithms and Information Retrieval in Java 3.47 avg rating — 36 ratings — 8 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Think OS: A Brief Introduction to Operating Systems really liked it 4.00 avg rating — 29 ratings — published 2014 — 5 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars

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Allen is Currently Reading

Allen Downey is currently reading

SNAFU: The Definitive Guide to History’s Greatest Screwups

by Ed Helms

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Jul 04, 2025 10:28AM

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Allen Downey finished reading The Life Impossible by Matt Haig (Goodreads Author)	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
Dec 16, 2025 09:11AM · like · preview book See a Problem? We’d love your help. Let us know what’s wrong with this preview of The Life Impossible by Matt Haig. Problem: Details (if other): Thanks for telling us about the problem. Not the book you’re looking for? Preview — The Life Impossible by Matt Haig <iframe sandbox id="wrongBookKindlePreviewScreen">
Allen Downey finished reading The Age of Diagnosis: How Our Obsession with Medical Labels Is Making Us Sicker by Suzanne O'Sullivan	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey wants to read It's All in Your Head: True Stories of Imaginary Illness by Suzanne O'Sullivan	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey is currently reading The Age of Diagnosis: How Our Obsession with Medical Labels Is Making Us Sicker by Suzanne O'Sullivan	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey finished reading The Magician King (The Magicians, #2) by Lev Grossman (Goodreads Author)	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
Dec 16, 2025 09:09AM · like · preview book See a Problem? We’d love your help. Let us know what’s wrong with this preview of The Magician King by Lev Grossman. Problem: Details (if other): Thanks for telling us about the problem. Not the book you’re looking for? Preview — The Magician King by Lev Grossman <iframe sandbox id="wrongBookKindlePreviewScreen">
Allen Downey wants to read The First Witch of Boston by Andrea Catalano (Goodreads Author) Goodreads Choice Awards Nominee in Readers' Favorite Historical Fiction	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey wants to read King of Kings: The Iranian Revolution—A Story of Hubris, Delusion and Catastrophic Miscalculation by Scott Anderson Goodreads Choice Awards Nominee in Readers' Favorite History & Biography	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey wants to read The Zorg: A Tale of Greed and Murder That Inspired the Abolition of Slavery by Siddharth Kara Goodreads Choice Awards Nominee in Readers' Favorite History & Biography	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey wants to read Atmosphere by Taylor Jenkins Reid (Goodreads Author) Goodreads Choice Awards Nominee in Readers' Favorite Historical Fiction, Readers' Favorite Audiobook	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Allen Downey wants to read The Life Impossible by Matt Haig (Goodreads Author)	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
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Quotes by Allen B. Downey (?)

“For all live births, the mean pregnancy length is 38.6 weeks, the standard deviation is 2.7 weeks, which means we should expect deviations of 2-3 weeks to be common.”
― Allen B. Downey, Think Stats

tags: explanations-math

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