Monthly Archives: December 2010

R: Basic R Skills – Splitting and Plotting

December 10, 2010
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R: Basic R Skills – Splitting and Plotting

I am giving a short R course next year, so I am going to make a series of blog posts to help get my thoughts and example code in order. The aim is to introduce people with little or no experience of R to the language with self contained examp...

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Once again, chart critics and graph gurus welcome

December 10, 2010
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Once again, chart critics and graph gurus welcome

HOW TO DISPLAY A LINE PLOT WITH COUNT INFORMATION? In a previously-mentioned paper Sharad and your DSN editor are writing up, there is the above line plot with points. The area of each point shows the count of observations. It’s done in R with ggplot2 (hooray for Hadley). We generally like this type of plot,

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Truly random [again]

December 9, 2010
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Truly random [again]

“The measurement outputs contain at the 99% confidence level 42 new random bits. This is a much stronger statement than passing or not passing statistical tests, which merely indicate that no obvious non-random patterns are present.” arXiv:0911.3427 As often, I bought La Recherche in the station newsagent for the wrong reason! The cover of the

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Illustrating CFAs – Graphviz

December 9, 2010
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Illustrating CFAs – Graphviz

So after yesterdays post you probably ran this fancy new confirmatory factor analysis (CFA) – showed your friends all the cool fit stats and… nothing. As important as doing things right is being able to let others know that. For CFA the method of choice to illustrate the connections between variables are path diagrams these

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Choosing colors for your charts with RColorBrewer

December 9, 2010
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Choosing colors for your charts with RColorBrewer

If you're creating a bar chart in R, how do you decide what colors the bars should be? Or if you're creating an image plot, what range of images should you use? The colors you choose can not only affect the viewer's interpretation of the graphic, it can also determine its aesthetic appeal, too. That's where the RColorBrewer package...

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Choosing colors for your charts with RColorBrewer

December 9, 2010
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Choosing colors for your charts with RColorBrewer

If you're creating a bar chart in R, how do you decide what colors the bars should be? Or if you're creating an image plot, what range of images should you use? The colors you choose can not only affect the viewer's interpretation of the graphic, it can also determine its aesthetic appeal, too. That's where the RColorBrewer package...

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Learning R

December 9, 2010
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Learning R

I have had to be primarily self taught in R and I still have a long way to go.  I like R way better than SAS but the documentation in SAS is way better (that's what happens when you pay people to do it full time).  However, there are innumera...

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New version of solaR (0.21)

December 9, 2010
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New version of solaR (0.21)

The version 0.21 of the solaR package is now available at CRAN. This package provides a set of calculation methods of solar radiation and performance of photovoltaic systems. The package has been uploaded to CRAN under the GPL-3 license. solaR is now able to calculate from both daily and sub-daily irradiation values. Besides, there are

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All together now – Confirmatory Factor Analysis in R

December 8, 2010
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Describing multivariate data is not easy. Especially, if you think that statisticians have not developed any new tools after the ANOVA and principal component analysis (PCA). For social and experimental scientists the most important new technique are structural equation models that combine measurement models (that substitute reliability analysis and PCA) and structural models (that substitute

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Slides from Revolution R: 100% R and More

December 8, 2010
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If you missed today's webcast on Revolution R Enterprise: 100% R and more, the slides from the presentation are now available for download, and a replay of the webcast (in WMV format) will be available at that same link very soon. And if you missed some of the links I mentioned in the presentation, here they are for your...

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