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Archive for 'R'

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 […]

Another rule of three, this one in statistics

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

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 […]

Turn your tough decisions into simple rules

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If you know R, you could building simple, accurate decision rules today with this sweet new package.

Heuristica: An R package for testing models of binary choice

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It just got a lot easier to simulate the performance of simple heuristics.

How many calories should you eat per day?

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How many calories should you eat per day, based on your age, sex, and activity level? Here are the US government’s recommendations.

R is now the number two statistical computing program in scholarly use

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We were surprised to see that R has passed SAS for scholarly use. We were surprised because we assumed this would have happened years ago.

Can’t compute the standard deviation in your head? Divide the range by four.

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Suppose you divide the range by four instead of taking the standard deviation. How accurate will you be?