Monthly Archives: May 2010

Vanilla Rao-Blackwellisation [re]revised

May 31, 2010
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Vanilla Rao-Blackwellisation [re]revised

Although the revision is quite minor, it took us two months to complete from the time I received the news in the Atlanta airport lounge… The vanilla Rao-Blackwellisation paper with Randal Douc has thus been resubmitted to the Annals of Statistics. And rearXived. The only significant change is the inclusion of two tables detailing computing

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MLB Baseball Pitching Matchups ~ manipulating pitch f/x data using the RMySQL package in R

May 31, 2010
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MLB Baseball Pitching Matchups ~ manipulating pitch f/x data using the RMySQL package in R

After downloading some pitch f/x data using my R script, we can finally have some fun. But because the pitch f/x data is very elaborate, R can easily get overwhelmed by copying the dataset back and forth in memory, as you manipulate the data. So the natural progression is to use relational database systems. Here,

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R 2.11.1 released

May 31, 2010
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It's official: R 2.11.1 is out. Source code and binaries for Windows and MacOS are available at the master CRAN mirror, and will be available for download from your local mirror soon. As anticipated, this is an update release focussing mainly on bugfixes and with just one new feature. According to R core team member Peter Dalgaard one fix...

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highlight 0.2-0

May 31, 2010
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I've released version 0.2-0 of highlight to CRAN This version brings some more additions to the sweave driver that uses highlight to produce nice looking vignettes with color coded R chunks The driver gains new arguments boxes, bg and border to c...

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Bike The Drive 2010

Memorial Day weekend is also time for the annual Bike The Drive in Chicago. This time only half the household got up bright and early and enjoyed Lakeshore Drive free of cars. A highly recommended event.

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Betting on Pi

May 31, 2010
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Betting on Pi

I was reading over at math-blog.com about a concept called numeri ritardatari. This sounds a lot like “retarded numbers” in Italian, but apparently “retarded” here is used in the sense of “late” or “behind” and not in the short bus sense. I barely scanned the page, but I think I got the gist of it:

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A data visualization manifesto

May 31, 2010
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Details matter (at least, they do for me), but we don't yet have a systematic way of going back and forth between the structure of a graph, its details, and the underlying questions that motivate our visualizations. (Cleveland, Wilkinson, and....

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JPM Chase Corporate Challenge 2010

It's Memorial Day weekend so it was time for the Chicago's JP Morgan Chase Corporate Challenge on Thursday. The weather was glorious, the usual 20-some thousand runners participated and a good time was had. Work had arranged for a nice tent, food, mu...

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Example 7.39: Nelson-Aalen estimate of cumulative hazard

May 31, 2010
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Example 7.39: Nelson-Aalen estimate of cumulative hazard

In our previous example, we demonstrated how to calculate the Kaplan-Meier estimate of the survival function for time to event data. A related quantity is the Nelson-Aalen estimate of cumulative hazard. In addition to summarizing the hazard incurred ...

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