1332 search results for "tutorial"

apply functions in R

August 31, 2010
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Getting to know the "apply"s in R is extremely handy for using the language efficiently and effectively. Unfortunately, the help files tend to be rather information-dense and are fairly overwhelming for newcomers. A recent blog post by Neil Saunders pr...

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apply functions in R

August 31, 2010
By

Getting to know the "apply"s in R is extremely handy for using the language efficiently and effectively. Unfortunately, the help files tend to be rather information-dense and are fairly overwhelming for newcomers. A recent blog post by Neil Saunders pr...

Read more »

Graphing Highly Skewed Data

August 30, 2010
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Graphing Highly Skewed Data

Graphing data with a few outliers is challenging, and some solutions are better than others. Here is a comparison of the alternatives.

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Oh (de)bugger!

August 26, 2010
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Oh (de)bugger!

By number of questions asked, R passed MATLAB for the first time on Stack Overflow today. Thus it seems an appropriate time to write my first R-based post. This post concerns what to  do when your R-code goes pear shaped. Back in June there were a couple of very good videos on R debugging that

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A brief introduction to “apply” in R

August 19, 2010
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A brief introduction to “apply” in R

At any R Q&A site, you’ll frequently see an exchange like this one: Q: How can I use a loop to ? A: Don’t. Use one of the apply functions. So, what are these wondrous apply functions and how do they work? I think the best way to figure out anything in

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Rose plot using Deducers ggplot2 plot builder

August 16, 2010
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The (excellent!) LearnR blog had a post today about making a rose plot in ggplot2. Following today’s announcement, by Ian Fellows, regarding the release of the new version of Deducer (0.4) offering a strong support for ggplot2 using a GUI plot builder, Ian also sent an e-mail where he shows how to create a rose plot using the new...

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Consultants’ Chart in ggplot2

August 16, 2010
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Consultants’ Chart in ggplot2

Excel Charts Blog posted a video tutorial of how to create a circumplex or rose or dougnut chart in Excel. Apparently this type of chart is very popular in the consulting industry, hence the “Consultants’ Chart”. It is very easy to make this chart in Excel 2010, but it involves countless number of clicks and

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Hard drive occupation prediction with R

Hard drive occupation prediction with R

On some environments, disk space usage can be pretty predictable. In this post, we will see how to do a linear regression to estimate when free space will reach zero, and how to assess the quality of such regression, all using R - the statistical soft...

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Hard drive occupation prediction with R – The linear regression

Hard drive occupation prediction with R – The linear regression

On some environments, disk space usage can be pretty predictable. In this post, we will see how to do a linear regression to estimate when free space will reach zero, and how to assess the quality of such regression, all using R - the statistical soft...

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Presentations and video from useR! 2010 available

August 13, 2010
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For anyone who missed the useR! 2010 conference in Gaithersburg last month (or just wants to revisit some of the amazing talks), you can now find slides from many of the contributed presentations available for download. (Look for the link to download slides.) The presentations from the Revolution team members are there, including: My presentation on Evolving R...

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