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Archive for 'Ideas'

Weighted population density

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DENSITY THE AVERAGE PERSON EXPERIENCES CLICK TO ENLARGE In Alaska, there’s about one person for each square mile of land. You might picture a typical Alaskan not being able to see the next house. But it’s not that way of course. Most of Alaska is uninhabited. People have crowded into a few areas. The average […]

Counterintuitive problem: Everyone in a room keeps giving dollars to random others. You’ll never guess what happens next.

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This was unexpected.

Counterintuitive probability problem of the day

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TWO SHOT RUSSIAN ROULETTE WITH 2 BULLETS OR AN EQUAL CHANCE OF 1 or 3 BULLETS With p as the probability of dying on one shot, this figure shows how to get the probability of living through the game. Peter Ayton is giving a talk today at the London Judgement and Decision Making Seminar Imagine […]

New York City streets are not as regular as you might think

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THINGS THAT ARE NOT CONTAINED IN OUR MENTAL MODELS The inaccurately named blog Stuff Nobody Cares About did a post on something we do care about. They got an old data table that shows that the distances between streets, the distances between avenues, and the width of street and avenues in New York City varies […]

Another rule of three, this one in statistics

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Here’s another rule of three, this one in statistics.

Darwin, the rule of three, and little use for higher mathematics

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Who knew that Darwin and Pearson had little faith in fancy math?

How many digits into pi do you need to go to find your birthday?

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FIND YOUR BIRTHDAY IN PI, IN THREE DIFFERENT FORMATS It was Pi Day (March 14, like 3/14, like 3.14, get it?) recently and Time Magazine did a fun interactive app in which you can find your birthday inside the digits of pi. However: 1) They only used one format of birthday, in which July 4th […]

The SJDM Newsletter is ready for download

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SOCIETY FOR JUDGMENT AND DECISION MAKING NEWSLETTER   The quarterly Society for Judgment and Decision Making newsletter can be downloaded from the SJDM site: http://sjdm.org/newsletters/ Dan Goldstein SJDM Newsletter Editor

The typical American lives only 18 miles from mom, but …

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LET’S PUT THAT INTO PERSPECTIVE The NYT had a nice infographic entitled “The typical American lives only 18 miles from mom“. They’re saying the median distance to mom is 18 miles. But when you look at the data in greater depth (thanks to the graph in the article, which we reproduce above), it looks like […]

Tools, methods to improve decision making, outcomes, information communication

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A while back, Decision Science News put out a call to the Society for Judgment and Decision Making email list looking for “tools, methods to improve decision making, outcomes, and information communication”. Here are the results of that call.