Monthly Archives: April 2009

Getting at the internals of R functions

April 20, 2009
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I got asked the question the other day about how to get to the internals of a function. I realized that this was not something that I had covered yet on my tips blog. read more

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opentick is no more

April 17, 2009
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opentick is no more

After a year of "we plan to accept new subscribers shortly", opentick has shut its doors completely. As of March 20th, the opentick service is no longer available.From opentick.com:3/16/2009To opentick subscribers, friends, supporters, contributors an...

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Barry3-Apdex Also Lives in R

April 17, 2009
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Barry3-Apdex Also Lives in R

As a by-product of my presentation on the Apdex Index at the NorCal CMG meeting, back in February, Guerrilla graduate, Stephen O'Connell, went off and did an implementation in R. You can read about it in this month's CMG MeasureIT and download his R-s...

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Webscraping using readLines and RCurl

April 14, 2009
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There is a massive amount of data available on the web. Some of it is in the form of precompiled, downloadable datasets which are easy to access. But the majority of online data exists as web content such as blogs, news stories and cooking recipes. ...

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Testing RSI(2) with R, First Steps

April 13, 2009
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Testing RSI(2) with R, First Steps

This is the first of a series of posts that will demonstrate how to build, test, and implement a trading strategy using my favorite FOSS, R. I chose the RSI(2) strategy because it has gotten considerable attention on trading blogs over the past 6 mont...

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Using partial name matching and match.arg

April 13, 2009
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Sorry it has been so long to write an R tip. I've been really busy with my research, which you would think would produce lots of tips, but apparently not. Anyway here is a little tip to look at. read more

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What’s better than R for exploratory data plots?

April 13, 2009
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I use R for just about everything, including exploratory data analysis and graphics. The only other package with which I have any familiarity is Mathematica. I've been generally satisfied with R graphics, although there are things that I alway...

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Labeled outliers in R boxplot

Labeled outliers in R boxplot

Boxplots are a good way to get some insight in your data, and while R provides a fine ‘boxplot’ function, it doesn’t label the outliers in the graph. However, with a little code you can add labels yourself:The numbers plotted next to ...

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GGobi and Choreography

April 12, 2009
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You might be interested in this rather unusual use of GGobi - to explore and understand dance! Noel Cressie, Ola Ahlqvist, and Hyowon Ban from the Ohio State University have been involved in a collaborative project centred around a William Forsythe mo...

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New Garmin Forerunner

April 10, 2009
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Going for a run--or a race--almost always meant grabbing the GPS and often also meant setting a target pace and distance. For the last four and a half years, this was measured by a Garmin Forerunner 201. That's the large rectangular model in the original "brick" form factor. I've come to love the device. Training is great because the distance log, as well...

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