Monthly Archives: December 2012

Oracle R Enterprise 1.3 released

December 26, 2012
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We're pleased to announce the latest release of Oracle R Enterprise, now available for download. Oracle R Enterprise 1.3 features new predictive analytics interfaces for in-database model building and scoring, support for in-database sampling and partitioning techniques, and transparent support for Oracle DATE and TIMESTAMP data types to facilitate data preparation for time series analysis and forecasting. Oracle...

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Recoding Polytomous Items with Missing Categories

December 26, 2012
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This function helps prepare data for analysis with models that require polytomous items to be coded from 0 to N without missing categories, such as the Partial Credit Model (Masters, 1982). When there are no missing categories, an item that was suppos...

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Wrapper functions in GNU R

December 26, 2012
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Recently I have been working with GNU R optimization routines a lot. Function optim has a nice trace option that allows to monitor optimization progress. Another standard function optimize has no such feature but it is pos...

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R Markdown to other document formats

December 26, 2012
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Perhaps you have a file written in Markdown with embedded R of the kind that RStudio makes so nice and easy but you’d like a range of output formats to keep your collaborators happy.  Say latex, pdf, html and MS Word.  Here’s what you might do I shall imagine your file is called doc.Rmd Install pandoc

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MeRRy ChRistmas!

December 25, 2012
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MeRRy ChRistmas!

Merry Christmas is.R() readers! Thanks for accompanying us through an excellent first semester of R blogging, and for your feedback and enthusiasm. To celebrate, we’ve built an image mosaic from the shiny, happy avatars of our over 600 (!) Twitter followers. Click for a beautiful mosaic! We’ll be back in 2013 with...

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Common words in the Gathering Storm

December 25, 2012
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Common words in the Gathering Storm

The Wheel of Time is a series of books started by Robert Jordan. Unfortunately he died too early. Like all fans of the series I feel very lucky that Brandon Sanderson was able to continue these books. The first book Sanderson wrote was the Gathering St...

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Who Survived on the Titanic? Predictive Classification with Parametric and Non-parametric Models

December 24, 2012
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Who Survived on the Titanic? Predictive Classification with Parametric and Non-parametric Models

I recently read a really interesting blog post about trying to predict who survived on the Titanic with standard GLM models and two forms of non-parametric classification tree (CART) methodology. The post was featured on R-bloggers, and I think it's worth a closer look. The basic idea was to figure out which of these three

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More about Aggregation by Group in R

December 24, 2012
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More about Aggregation by Group in R

Motivated by my young friend, HongMing Song, I managed to find more handy ways to calculate aggregated statistics by group in R. They require loading additional packages, plyr, doBy, Hmisc, and gdata, and are extremely user-friendly. In terms of CPU time, while the method with summarize() is as efficient as the 2nd method with by()

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Make a Christmas Tree in R with random ornaments/presents

December 24, 2012
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Make a Christmas Tree in R with random ornaments/presents

Happy holidays!     Link to Gist

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24 Christmas Gifts from is.R

December 24, 2012
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24 Christmas Gifts from is.R

The is.R blog has been on a roll in December with their Advent CalendaR feature: daily tips about R to unwrap each day leading up to Christmas. If you haven't been following it, start with today's post and scroll down. Sadly there isn't a tag to collect all these great posts together, but here are a few highlights: December...

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