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Quizzing the Anonymous - Гоп-стоп функционал
April 15th, 2014
10:50 am

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Гоп-стоп функционал
Начал замечать некоторые тенденции в ученых занятиях чикагских знакомых:

Exhibit A.
We study a reaction-diffusion system of partial differential equations, which can be taken to be a basic model for criminal activity. We show that the assumption of a populations natural tendency towards crime significantly changes the long-time behavior of criminal activity patterns. Under the right assumptions on these natural tendencies we first show that there exists traveling wave solutions connecting zones with no criminal activity and zones with high criminal activity, known as hotspots. This corresponds to an invasion of criminal activity onto all space. Second, we study the problem of preventing such invasions by employing a finite number of resources that reduce the payoff committing a crime in a finite region. We make the concept of wave propagation mathematically rigorous in this situation by proving the existence of entire solutions that approach traveling waves as time approaches negative infinity. Furthermore, we characterize the minimum amount of resources necessary to prevent the invasion in the case when prevention is possible. Finally, we apply our theory to what is commonly known as the gap problem in the excitable media literature, proving existing conjectures in the literature.
http://news.stanford.edu/news/2013/february/crime-math-model-020113.html
http://math.stanford.edu/~ryzhik/brr.pdf

Exhibit B
Combining transaction-level data on street prostitutes with ethnographic observation and official police force data, we analyze the economics of prostitution in Chicago. Prostitution, because it is a market, is much more geographically concentrated than other criminal activity. Street prostitutes earn roughly $25-$30 per hour, roughly four times their hourly wage in other activities, but this higher wage represents relatively meager compensation for the significant risk they bear. Prostitution activities are organized very differently across neighborhoods. Where pimps are active, prostitutes appear to do better, with pimps both providing protection and paying efficiency wages. Condoms are used only one-fourth of the time and the price premium for unprotected sex is small. The supply of prostitutes is relatively elastic, as evidenced by the supply response to a 4th of July demand shock. Although technically illegal, punishments are minimal for prostitutes and johns. A prostitute is more likely to have sex with a police officer than to get officially arrested by one. We estimate that there are 4,400 street prostitutes active in Chicago in an average week.
http://economics.uchicago.edu/pdf/Prostitution%205.pdf

Говорят: башня из слоновой кости. А бытие-то сильнее!

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From:vsparrow
Date:April 15th, 2014 04:03 pm (UTC)
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Примерно год назад кто-то выкладывал российскую работу в области экономики на тему взяточничества — типа как влияет коррупционная емкость ментов на рынок, и всё такое. "Нет позорного знания, всякое знание полезно", в этом роде.
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From:e2pii1
Date:April 15th, 2014 04:09 pm (UTC)
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Еще лет 10 назад видел статью с экономико-математическим анализом палестинских террористов-самоубийц и методов борьбы с ними. Там была сложная математическая формула включающая переменную v72 - "ожидаемое удовольствие от 72 девственниц в раю".
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From:leblon
Date:April 15th, 2014 04:19 pm (UTC)
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Ну, не все так печально. Есть еще люди, которые изучают по-настоящему фундаментальные вопросы. Например:

http://mysite.science.uottawa.ca/rsmith43/Zombies.pdf
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From:shkrobius
Date:April 15th, 2014 07:16 pm (UTC)
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Very insightful. There has been pandemics of the zombie movies, too.
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From:ez98
Date:April 15th, 2014 04:25 pm (UTC)
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Не понял, кто такой john. Клиент проститутки или проститутка мужского пола?
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From:nice_beaver
Date:April 15th, 2014 04:59 pm (UTC)
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Сутенер. Учите сленг!
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From:sereshka
Date:April 15th, 2014 05:32 pm (UTC)
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клиент все-таки.
сутенер это pimp.
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From:nice_beaver
Date:April 15th, 2014 05:39 pm (UTC)
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da
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From:vdinets
Date:April 15th, 2014 04:26 pm (UTC)
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Про проституток же вроде довольно старая работа? Меня в ней в свое время впечатлили данные об уровне коррумпированности ментов.
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From:shkrobius
Date:April 15th, 2014 07:14 pm (UTC)
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We call it "the Chicago way"...
From:saccovanzetti
Date:April 15th, 2014 05:53 pm (UTC)
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4th of July demand shock - это просто каникулы, или что-то патриотическое?
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From:shkrobius
Date:April 15th, 2014 07:13 pm (UTC)
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Stars & stripes forever!
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From:stas
Date:April 15th, 2014 10:22 pm (UTC)
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А, так это же Венкатеш. Он вроде пионер подобных исследований, у него ещё по наркоторговле и вообще жизни в проджектах очень интересные исследования и книги. Он как раз против башни :)
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From:shkrobius
Date:April 16th, 2014 12:18 am (UTC)
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Сижу, думаю: что я могу сделать для науки в этой области...

Кстати, adon xaxam нашел талантище покруче иных первопроходцев. Тот вообще ВСЕ на свете моделирует и успешно предсказывает.
http://en.wikipedia.org/wiki/Andrey_Korotayev
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From:sozdam_sustain
Date:April 16th, 2014 12:55 am (UTC)
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Пора выпускать кастеты с гравировочкой "I'm e^x"
From:reader574
Date:April 21st, 2014 10:05 am (UTC)
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По-моему, чепуха. Проститутки используют презервативы в очень близко в 100% случаев. Никакая доплата не решает вопрос. Это на уровне табу в их среде. А тут говорится про 25%.
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