Monthly Archives: February 2013

Introduction to Shiny Slides

February 9, 2013
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Below you can download the slides presented on February 9, 2013 at the Dallas R Users Group on RStudio’s Shiny framework which allows you to create interactive web applications in R. No knowledge of HTML or JavaScript is required! I introduce the alternatives and history of R programming on the web, the reactive programming model,

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Partial least squares path analysis

February 9, 2013
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Wayne Folta writes: I was looking for R packages to address a project I’m working on and stumbled onto a package called ‘plspm’. It seems to be a nice package, but the thing I wanted to pass on is the PDF that Gaston Sanchez, its author, wrote that describes PLS Path Analysis in general The post Partial...

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SoilWeb Updates

February 9, 2013
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SoilWeb Updates

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Learning R Using a Chemical Reaction Engineering Book: Part 4

February 8, 2013
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Learning R Using a Chemical Reaction Engineering Book: Part 4

The links to previous parts are listed here. (Part 1, Part 2, Part 3). In this part, I tried to recreate the examples in sections A.3.1 of the computational appendix in the reaction engineering book (by Rawlings and Ekerdt). Solving a … Continue reading →

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PID Control-R

February 8, 2013
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PID Control-R

On a whim, I thought it might be fun to try to implement a PID control algorithm ... in R.Yes, I know I have a strange idea of fun.BackgroundPID control is a heuristic method of automatically controlling processes as wide ranging as water levels in tan...

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Pills, half pills and probabilities

February 8, 2013
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Pills, half pills and probabilities

Yesterday, I was uploading some old posts to complete the migration (I get back to my old posts, one by one, to check links of pictures, reformating R codes, etc). And I re-discovered a post published amost 2 years ago, on nuns and Hell’s Angels in an airplaine. It reminded me an old probability problem (that might be known...

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SoilWeb Updates

February 8, 2013
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SoilWeb Updates

New Label Style! Some recent updates to SoilWeb. New visualizations will be incorporated into SoilWeb soon. read more

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packed off!!!

February 8, 2013
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packed off!!!

Deliverance!!! We have at last completed our book! Bayesian Essentials with R is off my desk! In a final nitty-gritty day of compiling and recompiling the R package bayess and the LaTeX file, we have reached versions that were in par with our expectations. The package has been submitted to CRAN (it has gone back

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Keep up with new R questions on StackOverflow with @StackOverflowR

February 8, 2013
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Last time I checked on the number of R questions on StackOverflow, back in June 2011, there were 5000. Today, there are 23,649. (For comparison, there are 15,649 questions about Matlab and 971 questions on SAS.) If you use Twitter, thanks to Trey Causey there's now an easy way to keep up with new R questions posted to StackOverflow....

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Using R to get h5-index for a list of journals

February 8, 2013
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In my last blog post I wrote about impact factors and h-index for different journals. That got me wondering about what the h5 index is for all of the journals that I read and may want to publish in. I could look them all up individually, but that sound...

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