Posts Tagged ‘ Uncategorized ’

My no loops in R hair shirt

July 27, 2012
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Being professional involved with analyzing source code I get to work with a much larger number of programming languages than most people. There is a huge difference between knowing the intricate details of the semantics of a language and being able to fluently program in a language like a native developer. There are languages whose

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Success does not require understanding

July 23, 2012
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I took part in the second Data Science London Hackathon last weekend (also my second hackathon) and it was a very different experience compared to the first hackathon. Once again Carlos and his team really looked after us. The data was released 24 hours before the competition started and even though I had spent less

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Impact of hardware characteristics on detectable fault behavior

June 29, 2012
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Impact of hardware characteristics on detectable fault behavior

Preface. This is the first of what I hope will be many posts analysing experimental data, that will eventually end up in my empirical software engineering with R book (this experiment was chosen because it happens to be the one I am currently working on; having just switched to using Asciidoc I have a backlog

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Updates to Old code

June 22, 2012
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Updates to Old code

I notice from time to time that people download code from the drop box. The drop box lags  CRAN.  I’ve upload the newest versions to the drop box. In the future I will post new releases to the drop box before I submit to CRAN.

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Background to my book project “Empirical Software Engineering with R”

June 21, 2012
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This post provides background information that can be referenced by future posts. For the last 18 months I have been working in fits and starts on a book that has the working title “Empirical Software Engineering with R”. The idea is to provide broad coverage of software engineering issues from an empirical perspective (i.e., the

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An example on sentiment analysis with R

June 21, 2012
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An example on sentiment analysis with R

by Yanchang Zhao, RDataMining.com There is a nice example on sentiment analysis with R at <http://viksalgorithms.blogspot.com.au/2012/06/tracking-us-sentiments-over-time-in.html>. In the example, the Wikileaks cable corpus is analyzed to track US sentiments of other countries and their presidents over time. The example describes … Continue reading →

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Color Palettes in RGB Space

June 20, 2012
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Color Palettes in RGB Space

Introduction I've recently been interested in how to communicate information using color. I don't know much about the field of Color Theory, but it's an interesting topic to me. The selection of color palettes, in particular, has been a topic I've been faced with lately. I downloaded 18 different sequential color palettes from Cynthia Brewer's

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ggplot2: Creating a custom plot with two different geoms

June 9, 2012
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ggplot2: Creating a custom plot with two different geoms

This past week for work I had to create some plots to show the max, min, and median of a measure across the levels of a qualitative variable, and show the max and min of the same variable within a … Continue reading →

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Load Packages Automatically in RStudio

June 6, 2012
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Load Packages Automatically in RStudio

I recently finished a long stretch of work on a particular project that required me to draw upon four R packages.  Each time I got back to my work on the project, I’d have to load the packages manually, as … Continue reading →

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PDF slides and R code examples on Data Mining and Exploration

June 4, 2012
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PDF slides and R code examples on Data Mining and Exploration

by Yanchang Zhao, RDataMining.com There are some nice slides and R code examples on Data Mining and Exploration at http://www.inf.ed.ac.uk/teaching/courses/dme/, which are listed below. PDF Slides: - Overview of Data Mining http://www.inf.ed.ac.uk/teaching/courses/dme/2012/slides/datamining_intro4up.pdf - Visualizing Data http://www.inf.ed.ac.uk/teaching/courses/dme/2012/slides/visualisation4up.pdf - Decision trees http://www.inf.ed.ac.uk/teaching/courses/dme/2012/slides/classification4up.pdf … Continue reading →

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