{"id":462,"date":"2020-07-06T14:30:48","date_gmt":"2020-07-06T14:30:48","guid":{"rendered":"https:\/\/www.allendowney.com\/blog\/?p=462"},"modified":"2020-07-06T14:30:48","modified_gmt":"2020-07-06T14:30:48","slug":"maxima-minima-and-mixtures","status":"publish","type":"post","link":"https:\/\/www.allendowney.com\/blog\/2020\/07\/06\/maxima-minima-and-mixtures\/","title":{"rendered":"Maxima, Minima, and Mixtures"},"content":{"rendered":"\n<p>I am hard at work on the second edition of <em>Think Bayes<\/em>, currently working on Chapter 6, which is about computing distributions of minima, maxima and mixtures of other distributions.<\/p>\n\n\n\n<p>Of all the changes in the second edition, I am particularly proud of the exercises.  I present three new exercises from Chapter 6 below.  If you want to work on them, you can use <a rel=\"noreferrer noopener\" href=\"https:\/\/colab.research.google.com\/github\/AllenDowney\/ThinkBayes2\/blob\/master\/code\/chap06.ipynb\" target=\"_blank\">this notebook<\/a>, which contains the material you will need from the chapter and some code to get you started.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Exercise 1<\/h4>\n\n\n\n<p>Henri Poincar\u00e9 was a French mathematician who taught at the Sorbonne around 1900. The following anecdote about him is probably fabricated, but it makes an interesting probability problem.<\/p>\n\n\n\n<p>Supposedly Poincar\u00e9 suspected that his local bakery was selling loaves of bread that were lighter than the advertised weight of 1 kg, so every day for a year he bought a loaf of bread, brought it home and weighed it. At the end of the year, he plotted the distribution of his measurements and showed that it fit a normal distribution with mean 950 g and standard deviation 50 g. He brought this evidence to the bread police, who gave the baker a warning.<\/p>\n\n\n\n<p>For the next year, Poincar\u00e9 continued the practice of weighing his bread every day. At the end of the year, he found that the average weight was 1000 g, just as it should be, but again he complained to the bread police, and this time they fined the baker.<\/p>\n\n\n\n<p>Why? Because the shape of the distribution was asymmetric. Unlike the normal distribution, it was skewed to the right, which is consistent with the hypothesis that the baker was still making 950 g loaves, but deliberately giving Poincar\u00e9 the heavier ones.<\/p>\n\n\n\n<p>To see whether this anecdote is plausible, let&#8217;s suppose that when the baker sees Poincar\u00e9 coming, he hefts\u00a0<code>n<\/code>\u00a0loaves of bread and gives Poincar\u00e9 the heaviest one. How many loaves would the baker have to heft to make the average of the maximum 1000 g?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Exercise 2<\/h4>\n\n\n\n<p>Two doctors fresh out of medical school are arguing about whose hospital delivers more babies. The first doctor says, &#8220;I&#8217;ve been at Hospital A for two weeks, and already we&#8217;ve had a day when we delivered 20 babies.&#8221;<\/p>\n\n\n\n<p>The second doctor says, &#8220;I&#8217;ve only been at Hospital B for one week, but already there&#8217;s been a 19-baby day.&#8221;<\/p>\n\n\n\n<p>Which hospital do you think delivers more babies on average? You can assume that the number of babies born in a day is well modeled by a\u00a0<a rel=\"noreferrer noopener\" href=\"https:\/\/en.wikipedia.org\/wiki\/Poisson_distribution\" target=\"_blank\">Poisson distribution<\/a>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Exercise 3<\/h4>\n\n\n\n<p>Suppose I drive the same route three times and the fastest of the three attempts takes 8 minutes.<\/p>\n\n\n\n<p>There are two traffic lights on the route. As I approach each light, there is a 40% chance that it is green; in that case, it causes no delay. And there is a 60% chance it is red; in that case it causes a delay that is uniformly distributed from 0 to 60 seconds.<\/p>\n\n\n\n<p>What is the posterior distribution of the time it would take to drive the route with no delays?<\/p>\n\n\n\n<p>The solution to this exercise is very similar to <a rel=\"noreferrer noopener\" href=\"https:\/\/patents.google.com\/patent\/US8385227B1\/en\" target=\"_blank\">a method I developed<\/a>\u00a0for estimating the minimum time for a packet of data to travel through a path in the internet.<\/p>\n\n\n\n<p>Again, <a href=\"https:\/\/colab.research.google.com\/github\/AllenDowney\/ThinkBayes2\/blob\/master\/code\/chap06.ipynb\" target=\"_blank\" rel=\"noreferrer noopener\">here&#8217;s the notebook where you can work on these exercises<\/a>.  I will publish solutions later this week.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I am hard at work on the second edition of Think Bayes, currently working on Chapter 6, which is about computing distributions of minima, maxima and mixtures of other distributions. Of all the changes in the second edition, I am particularly proud of the exercises. I present three new exercises from Chapter 6 below. If you want to work on them, you can use this notebook, which contains the material you will need from the chapter and some code to&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.allendowney.com\/blog\/2020\/07\/06\/maxima-minima-and-mixtures\/\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[71,16],"class_list":["post-462","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-bayesian-statistics","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Maxima, Minima, and Mixtures - Probably Overthinking It<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.allendowney.com\/blog\/2020\/07\/06\/maxima-minima-and-mixtures\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maxima, Minima, and Mixtures - Probably Overthinking It\" \/>\n<meta property=\"og:description\" content=\"I am hard at work on the second edition of Think Bayes, currently working on Chapter 6, which is about computing distributions of minima, maxima and mixtures of other distributions. 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You can preorder now from Bookshop.org and Amazon (those are affiliate links), or if you can't wait to get a paper copy, you can read the free, online version here. Here's the new cover, still featuring a\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2025\/04\/image-2.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2025\/04\/image-2.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2025\/04\/image-2.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2025\/04\/image-2.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":703,"url":"https:\/\/www.allendowney.com\/blog\/2022\/05\/02\/how-gaussian-is-it\/","url_meta":{"origin":462,"position":1},"title":"How Gaussian Is It?","author":"AllenDowney","date":"May 2, 2022","format":false,"excerpt":"This article is an excerpt from the current draft of my book Probably Overthinking It, to be published by the University of Chicago Press in early 2023. If you would like to receive infrequent notifications about the book (and possibly a discount), please sign up for this mailing list.This book\u2026","rel":"","context":"In \"Gaussian\"","block_context":{"text":"Gaussian","link":"https:\/\/www.allendowney.com\/blog\/tag\/gaussian\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2022\/04\/ansur_30_0.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":956,"url":"https:\/\/www.allendowney.com\/blog\/2023\/06\/10\/abstracts-and-keywords\/","url_meta":{"origin":462,"position":2},"title":"Abstracts and keywords","author":"AllenDowney","date":"June 10, 2023","format":false,"excerpt":"As Probably Overthinking It approaches the finish line, there are just a few more tasks: I am working on the index and -- as I have recently learned -- I also have to write a 200-word abstract, a list of keywords for each chapter, and a 250-word abstract for the\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1009,"url":"https:\/\/www.allendowney.com\/blog\/2023\/08\/27\/taming-black-swans\/","url_meta":{"origin":462,"position":3},"title":"Taming Black Swans","author":"AllenDowney","date":"August 27, 2023","format":false,"excerpt":"At SciPy 2023 I presented a talk called \"Taming Black Swans: Long-tailed distributions in the natural and engineered world\". Here's the abstract: Long-tailed distributions are common in natural and engineered systems; as a result, we encounter extreme values more often than we would expect from a short-tailed distribution. If we\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/img.youtube.com\/vi\/-rE3DfeZ_jE\/0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1229,"url":"https:\/\/www.allendowney.com\/blog\/2024\/02\/15\/think-python-third-edition\/","url_meta":{"origin":462,"position":4},"title":"Think Python third edition!","author":"AllenDowney","date":"February 15, 2024","format":false,"excerpt":"I am happy to announce the third edition of Think Python, which will be published by O'Reilly Media later this year. You can read the online version of the book here. I've posted the Preface and the first four chapters -- more on the way soon! You can read the\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.allendowney.com\/blog\/wp-content\/uploads\/2024\/02\/image.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":586,"url":"https:\/\/www.allendowney.com\/blog\/2021\/04\/30\/whats-new-in-think-bayes-2\/","url_meta":{"origin":462,"position":5},"title":"What&#8217;s new in Think Bayes 2?","author":"AllenDowney","date":"April 30, 2021","format":false,"excerpt":"I'm happy to report that the second edition of Think Bayes is available for preorder now. What's new in the second edition? 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