Monthly Archives: August 2011

Time Series Analysis and Mining with R

August 23, 2011
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Time Series Analysis and Mining with R

Time series data are widely seen in analytics. Some examples are stock indexes/prices, currency exchange rates and electrocardiogram (ECG). Traditional time series analysis focuses on smoothing, decomposition and forecasting, and there are many R functions and packages available for those … Continue reading →

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Random input software testing

August 23, 2011
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Random input software testing

The usual approach to testing software is to create a specific problem and see if the software gets the correct answer.  Although this is very useful, there are problems with it: It is labor-intensive It almost totally neglects to test the code that throws errors There can be unconscious bias in the test cases created … Continue reading...

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Experiences with using SAS and R in insurance and banking

August 23, 2011
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Experiences with using SAS and R in insurance and banking

In July 2011, Hong Ooi presented an engaging talk to Melbourne R Users Group. Both David Smith from Revolutions and Eugene Dubossarsky behind the Analyst First movement have discussed the presentation. The video of the talk is now available for … Continue reading →

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A warning on the R save format

August 23, 2011
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A warning on the R save format

The save() function in the R platform for statistical computing is very convenient and I suspect many of us use it a lot. But I was recently bitten by a “feature” of the format which meant I could not recover my data. I recommend that you save data in a data format (e.g. CSV or CDF), not using...

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Maiden voyage

August 23, 2011
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Maiden voyage

Who Me. I'm an associate professor of Statistics at Youngstown State University in Youngstown, Ohio, USA. I've been using R for about 7 years, Emacs about 3 years, git about 1 year, and Org-Mode for less than a year. What I want this blo...

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Subjugation to the Sigmas

August 23, 2011
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Subjugation to the Sigmas

No doubt you've heard about the tyranny of the 9s in reference to computer system availability. You're probably also familiar with the phrase six sigma, either in the context of manufacturing process quality control or the improvement of business processes. As we discovered in the recent Guerrilla Data Analysis Techniques class, the two concepts are related.

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Popular topics at the BioStar Q&A site

August 23, 2011
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Popular topics at the BioStar Q&A site

Which topics are the most popular at the BioStar bioinformatics Q&A site? One source of data is the tags used for questions. Tags are somewhat arbitrary of course, but fortunately BioStar has quite an active community, so “bad” tags are usually edited to improve them. Hint: if your question is “How to find SNPs”, then

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Drawdown Visualization

August 22, 2011
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Drawdown Visualization

Drawdown is my favorite measure of risk.  It picks up extended autocorrelated pain often not seen in risk measures, and best illustrates frustration, panic, and loss of confidence (Drawdown Control Can Also Determine Ending Wealth).  I though...

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More useR! 2011 roundups

August 22, 2011
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If you missed last week's worldwide R user conference at the University of Warwick, several attendees have posted informative roundups of the event. Check out these posts from Patrick Burns, Karl Broman, Colin Gillespie, Pairach Piboonrungroj and Richie Cotton (which features a rare, good Statistics joke). My own roundup of the conference was posted on Friday, in case you...

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Webinar Wednesday Aug 24: Revolution R Enterprise, 100% R and More

August 22, 2011
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A heads-up that I'll be giving a free webinar this Wednesday, August 24. In 30 minutes, I'll give an overview of the open-source R project and the additional features of Revolution R Enterprise: R users already know why the R language is the lingua franca of statisticians today: because it's the most powerful statistical language in the world. Revolution...

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