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Unemployment, 2000, for U.S. metropolitan areas: a surprising distribution
My colleague Keith Resendes (@histogramma1) is very interested in U.S. unemployment rates, utilizing data from the U.S. Bureau of Labor Statistics. After some data munging, I got unemployment data,...
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Mathematics majors: are most of you wasting time and money?
Below is a post on College Confidential, posted by mathematik on May 24, 2010: “Math majors beware: most of you are wasting time and money Here’s a story for all the math majors and future math majors...
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Happy April 1 Day
The 4! = 24 distinct fractions whose base 4 representation consists of permutations of the digits (0,1,2,3) repeated: These are all fractions of the form , namely those fractions with numerators 9,...
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Graduated with a math degree… feel like a moron
This is a follow-up to the recent post Mathematics majors: are most of you wasting time and money? The following post was made on WrongPlanet during the height of the Great Recession, so it’s perhaps a...
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Geogebra and statistics
The Geogebra folks continue to work at developing the capabilities of this lovely open source software. In February this year they added a spreadsheet capability to the software I have a bunch of...
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Mathematics is not a spectator sport
In the video below, Aziz Belhassane Sensei is demonstrating Aikido at the Sugano Shihan Memorial Summer School 2011. Whether you know Aikido or not, the thing you will notice, especially if I point it...
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A cute discrete dynamical system
Jim Tanton (@jamestanton) posed the problem of 6 positive integers such that the product of any two of them is a multiple of their sum (preferably 6 integers with no common factors). Inspired by Jim’s...
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Getting to grips with Python
Credits: Jon Hanrahan & Australian Broadcasting Commission I know, the programming language Python is named for Monty Python, but I think the picture is funny. She’s certainly got control of...
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Wishin’ and hopin’…
Credits: BEVK12 & Australian Broadcasting Commission This guy’s situation reminds of the Dusty Springfield song; “ Wishin’ and hopin’ and thinkin’ and prayin’ Plannin’ and dreamin’ …” I love the...
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Where do you weigh a pie?
Credits: Anne Margo & Australian Broadcasting Commission Somewhere over the rainbow (way up high).
View ArticleThe leading (base 10) digit of an integer
Surely the leading (= left-most) digit of a positive integer is an obvious thing? Just stare at the integer (e.g. 7823) and observe the left-most digit (7, in this example)? Suppose, however, that you...
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Excel statistical functions: AVERAGE
Excel has many statistical functions. Here is a description of one of the most commonly used: AVERAGE
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Apparent puzzles with goodness-of-fit tests
Given two data sets it is a not unreasonable question to ask if they have similar distributions. For example, if we produce one data set of 500 numbers between 0 and 1, chosen uniformly and randomly...
View ArticleIndividual gain and engagement with mathematical understanding
My colleague Mercedes McGowen and I examined a measure of individual student gain by pre-service elementary teachers, related to Richard Hake’s use of mean gain in the study of reform classes in...
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Coffee, Love and Matrix algebra – a review
Gary Ernest Davis Publisher: Republic of Mathematics Publication Date: 2014 Number of Pages: 389 Format: Paperback ISBN: 9780692262306 x x Reviewed by David A. Huckaby, on 11/12/2014 David A....
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The number 3608528850368400786036725
Ben Vitale (@BenVitale) announced that 3608528850368400786036725 is a 25 digit number with the property that each number formed by its first n digits is divisible by n, for n from 1 through 25. How...
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Data analysis: R functions for beginners
x What is a function, anyway? x For programming purposes, one should think of a function as a type of object that takes certain types of INPUTS, and – once those inputs are given – produces a definite...
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