Monthly Archives: April 2011

CoKriging with gstat – Videotutorial

April 13, 2011
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This is the last lesson of the R Videotutorial for spatial statistics.It is all about cokriging in gstat. For this lesson I used the meuse dataset, available within gstat, for the references to this dataset take a look at the script.The videotutorial i...

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CoKriging with gstat – Videotutorial

April 13, 2011
By

This is the last lesson of the R Videotutorial for spatial statistics.It is all about cokriging in gstat. For this lesson I used the meuse dataset, available within gstat, for the references to this dataset take a look at the script.The videotutorial i...

Read more »

Screening for predictive characteristics … and a mea culpa

Screening for predictive characteristics … and a mea culpa

In my last post, I considered the UCI mushroom dataset and characterized the variables included there using four different interestingness measures.  When I began drafting this post, my intention was to consider the question of how the different m...

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Journal of Statistical Software. Vol. 40

April 12, 2011
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The latest edition of the Journal of Statistical Software is out, with plenty of interesting articles for R users. A must-read is Hadley Wickham's article on "The Split-Apply-Combine Strategy for Data Analysis", which makes a compelling argument for the use of the plyr package to partition datasets and apply sub-group analyses. Also, anyone who hasn't yet purchased a copy...

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Using tikzDevice with Sweave in R 2.13

April 12, 2011
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R 2.13 introduces an option to specify a custom graphics device in an Sweave code chunk. This is really cool and allows you to use tikzDevice output like pgfSweave does. In an pinch, say when you dont have access to any non-core packages, you can use tikzDevice output with the regular Sweave driver (RweaveLatex) more

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Video Tutorial on Robust Standard Errors

April 12, 2011
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Video Tutorial on Robust Standard Errors

Update: I have included a modified version of this summaryR() command as part of my package tonymisc, which extends mtable() to report robust standard errors. The tonymisc package is available on CRAN through the install.packages() command.If you have...

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Video Tutorial on Robust Standard Errors

April 12, 2011
By
Video Tutorial on Robust Standard Errors

Update: I have included a modified version of this summaryR() command as part of my package tonymisc, which extends mtable() to report robust standard errors. The tonymisc package is available on CRAN through the install.packages() command.If you have...

Read more »

Measuring Price Dispersion of Marijuana

April 12, 2011
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Measuring Price Dispersion of Marijuana

The intersection of mapping APIs, fast database operations and user engagement offers a lot of very cool crowdsourcing applications ranging from the benign and powerful (Google’s Person Finder) to the minor and questionable (A DUI checkpoints app). Most intriguing in … Continue reading →

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Using R + Bioconductor to Get Flanking Sequence Given Genomic Coordinates

April 12, 2011
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Using R + Bioconductor to Get Flanking Sequence Given Genomic Coordinates

I'm working on a project using next-gen sequencing to fine-map a genetic association in a gene region. Now that I've sequenced the region in a small sample, I'm picking SNPs to genotype in a larger sample. When designing the genotyping assay the lab wi...

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Using R + Bioconductor to Get Flanking Sequence Given Genomic Coordinates

April 12, 2011
By

I'm working on a project using next-gen sequencing to fine-map a genetic association in a gene region. Now that I've sequenced the region in a small sample, I'm picking SNPs to genotype in a larger sample. When designing the genotyping assay the lab wi...

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