Posted on Categories Statistics, TutorialsTags , , , 1 Comment on I still think you can manufacture an unfair coin

I still think you can manufacture an unfair coin

In Gelman and Nolan’s paper “You Can Load a Die, But You Can’t Bias a Coin” The American Statistician, November 2002, Vol. 56, No. 4 it is argued you can’t easily produce a coin that is biased when flipped (and caught). A number of variations that can be easily biased (such as spinning) are also discussed.

Obviously Gelman and Nolan are smart and careful people. And we are discussing a well-regarded peer-reviewed article. So we don’t expect there is a major error. What we say is the abstraction they are using doesn’t match the physical abstraction I would pick. I pick a different one and I get different results. This is what I would like to discuss. Continue reading I still think you can manufacture an unfair coin

Posted on Categories Opinion, Programming, Rants, Statistics, TutorialsTags , , , , 3 Comments on What can be in an R data.frame column?

What can be in an R data.frame column?

As an R programmer have you every wondered what can be in a data.frame column? Continue reading What can be in an R data.frame column?

Posted on Categories Administrativia, Practical Data Science, Pragmatic Data Science, Pragmatic Machine Learning, StatisticsTags , ,

New video course: Campaign Response Testing

I am proud to announce a new Win-Vector LLC statistics video course:



Campaign Response Testing
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John Mount, Win-Vector LLC

Continue reading New video course: Campaign Response Testing

Posted on Categories Coding, Programming, Statistics, TutorialsTags , , ,

How and why to return functions in R

One of the advantages of functional languages (such as R) is the ability to create and return functions “on the fly.” We will discuss one good use of this capability and what to look out for when creating functions in R. Continue reading How and why to return functions in R