303 search results for "boxplot"

Some Additional Thoughts on Useless Averages

Some Additional Thoughts on Useless Averages

In my last post, I described three situations where the average of a sequence of numbers is not representative enough to be useful: in the presence of severe outliers, in the face of multimodal data distributions, and in the face of infinite-variance distributions.  The post generated three interesting comments that I want to respond to here.First and foremost, I...

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When are averages useless?

When are averages useless?

Of all possible single-number characterizations of a data sequence, the average is probably the best known.  It is also easy to compute and in favorable cases, it provides a useful characterization of “the typical value” of a sequence of numbers.  It is not the only such “typical value,” however, nor is it always the most useful one: two other...

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ggplot2 Version of Figures in “25 Recipes for Getting Started with R”

August 16, 2011
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ggplot2 Version of Figures in “25 Recipes for Getting Started with R”

In order to provide an option to compare graphs produced by basic internal plot function and ggplot2, I recreated the figures in the book, 25 Recipes for Getting Started with R, with ggplot2.The code used to create the images is in separate paragraphs, allowing easy comparison.Read...

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R Code Examples on Graphics

August 16, 2011
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R Code Examples on Graphics

Some useful R code examples on  graphics are: Learn R Toolkit: It contains PowerPoint slideshows, videos, R scripts and data files to help Excel users move up to R. R code examples are provided for panel charts, conditional format, dot … Continue reading →

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lm System on Nikkei with New Chart

August 15, 2011
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lm System on Nikkei with New Chart

I got a great idea from the zoo-overplot demo to make a very helpful visualization of system entry and exit.  Since the lm-based system presented in Unrequited lm Love is newest, I will use this system, but apply to the Nikkei 225 instead of the R...

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Unrequited lm Love

August 14, 2011
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Unrequited lm Love

In System Failure-Maybe it Will Help I presented the initial trials of a linear model system for stocks, and even though they were not a resounding success, I have been strangely determined to discover a working version of this framework.  Maybe t...

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High-Performance in Cloud Computing

August 11, 2011
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High-Performance in Cloud Computing

Very often scientists are worried about performance and security in cloud computing. Especially, when talking about High-Performance Computing (HPC) in the cloud it is a very important aspect to proof efficient calculation speed in the cloud. Cloud computing describes a new delivery model for IT services based on Internet protocols, and it typically involves provisioning

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[R][ggplot2][R-bloggers]RcmdrPlugin.KMggplot2_0.0-3 is on CRAN now

July 28, 2011
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[R][ggplot2][R-bloggers]RcmdrPlugin.KMggplot2_0.0-3 is on CRAN now

RcmdrPlugin.KMggplot2 (CRAN) I posted an Rcmdr plug-in for a ”ggplot2” GUI front-end on CRAN. This version supports Kaplan-Meier plot and other plots as follow: Kaplan-Meier plot Show no. at risk on inside Show no. at risk table on outside Histogram Colo

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Shorting Mebane Faber

July 19, 2011
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Shorting Mebane Faber

Although I do not personally know Mebane Faber, I know enough that I do not want to short him. However, I thought it would be insightful to see how the short side of his “A Quantitative Approach To Tactical Asset Allocation” might look.  Once ...

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What is your favorite R feature? (part 2)

What is your favorite R feature? (part 2)

This week in our blog we started a list of great R code (www.r-project.org) snippets: http://cloudnumbers.com/what-is-your-favorite-r-feature We are going to extend this list with several more nice R features. Please feel free to add comments with your favorite R code snippets. Descriptive statistics: A huge set of tools to describe and explore data is available

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