Articles by David Robinson

K-means clustering is not a free lunch

January 15, 2015 | David Robinson

I recently came across this question on Cross Validated, and I thought it offered a great opportunity to use R and ggplot2 to explore, in depth, the assumptions underlying the k-means algorithm. The question, and my response, follow. K-means is a widely used method in cluster analysis. In my understanding, ... [Read more...]

Can R and ggvis help solve Serial’s murder?

December 22, 2014 | David Robinson

Like much of America, I followed season one of Sarah Koenig’s true-crime podcast Serial with an interest that bordered on obsession. Serial tells the story of the Baltimore 1999 murder of high-schooler Hae Min Lee, and of state prisoner Adnan Syed, who was convicted of the crime but to this ...
[Read more...]

Are high-reputation users quitting Stack Overflow?

December 14, 2014 | David Robinson

I spend a good amount of time on the programming Q+A site StackOverflow (and a smaller amount of time on its statistics sister site, Cross Validated). Recently this question on Meta Stack Overflow (the website’s discussion forum) caught my attention, raising the question of whether Stack Overflow had ... [Read more...]
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