Monthly Archives: August 2013

OpenCPU 1.0 release!

August 27, 2013
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OpenCPU 1.0 release!

After more than 3 years of development, we release the first official version of the OpenCPU system. Based on feedback and experiences from the beta series, OpenCPU version 1.0 has been rewritten entirely from scratch. The result is simple and flexible API that is easier to understand yet more powerful than before. With the new...

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googleVis 0.4.4 released with new formatting options for tables

August 26, 2013
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Over the weekend googleVis 0.4.4 found its way to CRAN. The function gvisTable gained a new argument formats that allow users to define the formats numbers displayed in tables. Thanks to J. Buros, who contributed the code.ExampleLoadingSession InfoR ve...

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mfg, mfcol, mfrow, and layout() – secret friends

August 26, 2013
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I was working on an issue (enhancement) today in my groan R-package today that required adding additional plotting elements via lines() and points() to a device that had already been partitioned by layout(). The code I wanted to use was essentially: #...

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R, Twitter and URLs

August 26, 2013
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R, Twitter and URLs

Yesterday evening, I wanted to play with Twitter, and see which websites I was using as references in my tweets, to get a Top 4 list. The first problem I got was because installing twitteR on Ubuntu is not that simple ! You have to install properly RCurl… But you before install the package in R, it is necessary...

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Revolution Analytics: Top Innovator for Data Visualization

August 26, 2013
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Revolution Analytics: Top Innovator for Data Visualization

We're proud that Revolution R Enterprise recently received the award for Top Innovator for Data Visualization from DataWeek. The R language has long been at the forefront of data visualization, and is the graphical engine behind many of the unique data visualizations you often see on the web and in print, including in the New York Times, at FlowingData...

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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #7)

August 26, 2013
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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #7)

More exciting (and important!) news about MCMSki IV: First, some if not all of the 9 invited and the 16 contributed sessions are about now documented by abstracts. The program is completely set! If you plan to present a poster, remember to send me by email (a) surname, name (institution): title as the subject, (b)

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Using R to visualize Karpov-vs-Kasparov Lifetime winner-take-all tally

August 26, 2013
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Using R to visualize Karpov-vs-Kasparov Lifetime winner-take-all tally

The Karpov vs. Kasparov rivalry holds a special place in the chess world.The idea behind this analysis is simple. If we take their lifetime games, plot the wins, what would it look like? We introduce one twist -- we'll be plotting the "winner-take-all"...

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Latent Variable Mixture Modeling: When Heterogeneity Requires Both Categories and Dimensions

August 26, 2013
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Latent Variable Mixture Modeling:  When Heterogeneity Requires Both Categories and Dimensions

Dichotomies come easily to us, especially when they are caricatures as shown in this cartoon.  These personality types do seem real, and without much difficulty, we can anticipate how they might react in different situations.  For example, if...

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Survival analysis in R: Weibull and Cox proportional hazards models

August 26, 2013
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I describe how to estimate the Weibull accelerated failure time model and the Cox proportional hazards model, test the assumptions, make predictions, and plot survival functions using each model. Survival analysis in R: Weibull and Cox proportional haz...

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Types of Data on R

August 26, 2013
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Types of Data on R

There are different types of data on R. I use type here as a technical term, rather than merely a synonym of “variety”.  There are three main types of data: Numeric: ordinary numbers Character: not treated as a number, but as a word. You cannot add two characters, even if they appear to be numerical. Characters

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