Monthly Archives: July 2012

automated cell phenotyping — R package “EBImage”

July 5, 2012
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automated cell phenotyping — R package “EBImage”

Counting cells under microscope is always laborious and null. Those in the art would be relieved with assistance of a powerful image processing package, EBImage. Images are treated as “Image” objects, essentially multi-dimensional arrays. The class “Image” contains spatial information, pixel … Continue reading →

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Soda vs. Pop with Twitter

July 5, 2012
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Soda vs. Pop with Twitter

One of the great things about Twitter is that it’s a global conversation anyone can join anytime. Eavesdropping on the world, what what! Of course, it gets even better when you can mine all this chatter to study the way humans live and interact. For example, how do people in New York City differ from those...

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More Exploration of Crazy RUT

July 5, 2012
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More Exploration of Crazy RUT

Unintentionally while playing with the lawstat package in R, I started trying to build systems (STANDARD DISCLAIMER: NOT INVESTMENT ADVICE AND WILL LOSE LOTS OF MONEY SO PROCEED WITH CAUTION) based on the Jarque Bera test of normality (entry in Wikiped...

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A better ‘nls’ (?)

July 5, 2012
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A better ‘nls’ (?)

Those that do a lot of nonlinear regression will love the nls function of R. In most of the cases it works really well, but there are some mishaps that can occur when using bad starting values for the parameters. One of the most dreaded is the “singular gradient matrix at initial parameter estimates” which

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Health Care Costs – Part 1, "The Problem"

July 5, 2012
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Health Care Costs – Part 1, "The Problem"

The Problem In the United States, health care costs have been going up for a number of years, even when adjusted for inflation. Not unlike a runaway freight train, this rampant inflation cannot continue indefinitely without crashing. ...

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New R User Group in Leipzig, Germany

July 5, 2012
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Leipzig R Statistical Computing is the sixth local R user group in Germany, and has been holding meetings since February. In the next meeting on July 12, member Claudia Beleites will talk about her pacakges softclassval (for classifier performance measures) and hyperspec (for hyperspectral data). meetup.com: Leipzig R Statistical Computing

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Validating email adresses in R

July 5, 2012
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I currently program an automated report generation in R – participants fill out a questionnaire, and they receive a nicely formatted pdf with their personality profile. I use knitr, LaTex, and the sendmailR package. Some participants did not provide valid email addresses, which caused the sendmail function to crash. Therefore I wanted some validation of

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A tiny RCurl headache ;)

July 4, 2012
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As more and more data go online (plus we love Google Drive) we are forced to connect to our data over the net. We mostly do this via RCurl (but we could do this using RGoogleDocs as well).In that case all that is required to get the data into R is the two lines of

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A tiny RCurl headache ;)

July 4, 2012
By

As more and more data go online (plus we love Google Drive) we are forced to connect to our data over the net. We mostly do this via RCurl (but we could do this using RGoogleDocs as well).In that case all that is required to get the data into R is the two lines of ...read more

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A new open journal on Data Science

July 4, 2012
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Springer has introduced a new open, peer-reviewed journal focused on Data Science: EPJ Data Science. What makes this a Data Science journal is novel uses of statistics, data analysis, computer techniques and public data sources to research a topic in another domain, rather than methodological research. Here are a few examples of the papers you'll find in the journal:...

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