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David Landy
Worked at University of Richmond
Attended Alma College
Lived in Richmond, Virginia
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David Landy

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Delightfully obvious idea!
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David Landy

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I love big numbers mistakes. This one is really cute.  All our problems are solved by the lottery:

https://davidlandy.net/millions-and-billions-and-obamacare/
For a long time now, I've been writing journal articles and blog posts about large number innumeracy. A basic take-away from my research has been that untrained members of the general population have a wide range of skills for dealing with large numbers. Basically, people are very competent at ...
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LOL
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Sigh.  More big numbers nonsense. The pentagon didn't lose $8.5 trillion dollars.

https://davidlandy.net/no-the-pentagon-didnt-lose-8-5-trillion/
Reuters has an interesting article which has been making the rounds recently, which is summarized by ignorant inattentive articles asserting that the Pentagon “doesn't have a clue" how it spent $8.5 trillion. Now, I'm no fan of military spending—but I'm an implacable enemy of lying about numbers ...
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David Landy

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I just put my two cents in on Uri Simonsohn's post on data colada.  I'm not buying what he's selling, but I guess I'm not buying what he's dissing either: https://davidlandy.net/when-is-a-test-biased/
Data Colada recently posted a comment (written by Uri Simonsohn) on a supposed 'bias' lurking a common default Bayesian alternative to the t-test. Point #1 was that the Bayesian T-test is 'biased' against low power results. Several smart people have made sophisticated and pretty sensible ...
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I tend to be pretty dismal about that, frankly. It may be good 'medicine', to get people away from fetishizing p-values.  However, it struck me as a licensing of sloppy experimental/statistical practice, rather than as a way of improving it.  I would frankly be happier if they said either (a) "be very statistically persuasive, but we don't care exactly how", or (b) "we don't really care if your results are true/replicable".  We'll see, of course, but I worry that that journal will become a journal of "p=0.06? Can't publish in your regular journal, but you like your theory?  No problem!".
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David Landy

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I get really annoyed sometimes at the way information is presented in the world. For instance, Ipsos Mori just published a poll which shows that perception of number is psychophysically scaled, did some very wrong math on it, and dressed it up as an "index of ignorance".

http://davidlandy.net/the-ignorance-of-the-ipsos-mori-ignorance-index/
The ignorance of the Ipsos Mori Ignorance Index. A number of news outlets and otherwise sophisticated blogs are reporting on the Ipsos Mori "Index of Ignorance", where the polling group purports to gather data about how people misunderstand and 'overestimate' proportions of various values in ...
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David Landy

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In case you want to know what it's like, it's like this.

That bus turned out to be empty; still turned on, just abandoned.
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There's a neat new study about "Bedtime Math".  The authors talk about how great the books and apps are.  They are not wrong, but it's not the whole story. I tell you the secret truth here: https://davidlandy.net/the-dangerous-lie-of-bedtime-math/
Attention conservation notice: Short (500 words), but entirely misleading, though honest, criticism of actually really solid work on a great idea. Take whatever time you were going to spend reading this, and use it to read Bedtime Math with your kids instead. So, recently some very smart folks ...
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David Landy

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Zach Horne, John Hummel and friends have a fascinating new study on how to convince people to vaccinate. 
 
Countering anti-vaccination attitudes

The "new study" linked in this article:

http://www.pnas.org/content/early/2015/07/28/1504019112

is ours, baby!
A study shows people just don't like being told they are wrong -- even when they're wrong.
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Have him in circles
123 people
Laura Crawford's profile photo
Thad Martin's profile photo
Scott T. Allison's profile photo
Dirk Bernhardt-Walther's profile photo
Trunnell Insurance Services LLC's profile photo
Heather Lewis's profile photo
Rakesh Pal's profile photo
Natty Berry's profile photo
Pamela Clevenger's profile photo
Education
  • Alma College
    Computer Science, Physics, Mathematics, 1995 - 1999
  • Indiana University
    Cognitive Science, Computer Science, 2001 - 2007
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Male
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Professor
Employment
  • University of Richmond
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Previously
Richmond, Virginia - Mason, Michigan - Bloomington, Indiana - Tucson, Arizona - Champaign, Illinois