Statistics

Statistics Blogs

Jobs at Amazon

October 31, 2014
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Jobs at Amazon

I do not normally post job adverts, but this was very specifically targeted to “applied time series candidates” so I thought it might be of sufficient interest to readers of this blog. Here is an excerpt from an email I received from someone at Amazon: Amazon is aggressively recruiting in the data sciences, and we […]

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Interactive plot of car crash stats

October 31, 2014
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Interactive plot of car crash stats

I spent the afternoon making a D3-based interactive version of the graphs of car crash statistics by state that I’d discussed yesterday: my attempt to improve on the graphs in Mona Chalabi‘s post at 538. See it in action here. Code on gith...

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Testing……1, 2, 3, ……

October 30, 2014
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Testing……1, 2, 3, ……

I often think that most courses in econometric theory are somewhat unbalanced. Much more attention is given to estimation principles and estimator properties than is given to the principles of hypothesis testing, the properties of tests.This always str...

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How a fraud detection algorithm conspired to ruin my recent trip

October 30, 2014
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I have been traveling quite a bit lately, and last week, I went to Rome for a few days, and spent time at the KDIR conference. Rome is one of my favorite destinations and apart from the architecture and museums, and the restaurants, I also enjoy shopping there. To my dismay, a gray cloud followed me around this entire trip - in the form of a misfiring fraud detection algorithm.…

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Bias/variance tradeoff as gamesmanship

October 30, 2014
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Bias/variance tradeoff as gamesmanship

Continuing our series of reading out loud from a single page of a statistics book we look at page 224 of the 1972 Dover edition of Leonard J. Savage’s “The Foundations of Statistics.” On this page we are treated to an example attributed to Leo A. Goodman in 1953 that illustrates how for normally distributed […] Related posts: Automatic bias correction doesn’t fix omitted variable bias Reading the Gauss-Markov theorem…

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"Football"… I mean "soccer"… I mean "football"…

October 29, 2014
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A couple of weeks ago, I was contacted by Daniel Weitzenfeld $-$ a Chicago freelance data scientist (his own definition). Daniel got interested in modelling sports results and googled our football paper $-$ in his post here, he jokes that, be...

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Econometrics Term Test

October 29, 2014
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Econometrics Term Test

A few days ago the students in my introductory graduate Econometrics course had their mid-term test.Here's the test, and a brief solution.How did you fare?© 2014, David E. Giles

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Improved graphs of car crash stats

October 29, 2014
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Improved graphs of car crash stats

Last week, Mona Chalabi wrote an interesting post on car crash statistics by state, at fivethirtyeight.com. I didn’t like the figures so much, though. There were a number of them like this: I’m giving a talk today about data visualization [slides | github], and I thought this would make a good example, so I spent […]

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Calculating the sum or mean of a numeric (continuous) variable by a group (categorical) variable in SAS

Calculating the sum or mean of a numeric (continuous) variable by a group (categorical) variable in SAS

Introduction A common task in data analysis and statistics is to calculate the sum or mean of a continuous variable.  If that variable can be categorized into 2 or more classes, you may want to get the sum or mean for each class. This sounds like a simple task, yet I took a surprisingly long time […]

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Would You Like Some Hot Potatoes?

October 29, 2014
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Would You Like Some Hot Potatoes?

O.K., I know - that was a really cheap way of getting your attention.However, it worked, and this post really is about Hot Potatoes - not the edible variety, but some teaching apps. from "Half-Baked Software" here at the University of Victoria.To quote...

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