Monthly Archives: November 2009

Rcpp 0.6.7

November 8, 2009
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Version 0.6.7 of the Rcpp package---a set of C++ classes making it easier to glue C/C++ code to R---is now on CRAN and Debian. This is a fairly incremental release that contains just a few small changes that arose since the previous release in August. One change is that a new type RcppList was added which allows us to build...

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New R-Forge Site for Quantitative Pedology

November 8, 2009
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New R-Forge Site for Quantitative Pedology

Just back from the annual meetings, and it looks like there is a significant interest in collaborative R coding of soils-related algorithms and visualization. A new R-forge site has been created to host Algorithms for Quantitative Pedology. Public release of the 'soil' package should be ready in a couple weeks. Soil Profile Dendrogram

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Network of People who Twitter about R

November 7, 2009
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On Tuesday I will be speaking to the Bay Area R group about doing social network analysis in R with igraph. During the talk I will (hopefully) be doing some live SNA on the audience using R and generating data via Twitter. As a preview, or small taste for those not able

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PMML and Open Source Data Mining

November 6, 2009
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PMML and Open Source Data Mining

Open source tools provide a cost-effective, yet powerful option for data mining. The following contenders adhere to the PMML standard which facilitates model exchange among open source and commercial vendors, providing a definitive route for production deployment of predictive models. The R ProjectThe R Project for Statistical Computing is definitely the...

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R Tutorial Series: Zero-Order Correlations

November 6, 2009
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R Tutorial Series: Zero-Order Correlations

One of the most common and basic techniques for analyzing the relationships between variables is zero-order correlation. This tutorial will explore the ways in which R can be used to employ this method.Tutorial FilesBefore we start, you may want to dow...

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Creating scatter plots using ggplot2

November 6, 2009
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Creating scatter plots using ggplot2

The ggplot2 package can be used as an alternative to lattice for producing high quality graphics in R. The package provides a framework and hopefully simple interface to producing graphs and is inspired by the grammar of graphics. The main function for producing graphs in this package is qplot, which stands for quick plot. The first

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Top Five Open Source Projects of 2009

November 5, 2009
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Every year, I single out what I think are the Top Five open source projects. This year, there's only one hold-over from previous years, and it's likely that I'm just going to give it a Lifetime Achievement Award and pick five others next year. 5. NetBe...

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opentick alternatives

November 5, 2009
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opentick alternatives

I've been getting a bit of traffic from people searching for opentick (the defunct company), so I've started a list of similar (but non-free) data providers. I'm not affiliated with any of these vendors, and the list is in no particular order. I'll u...

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R has a JSON package

November 5, 2009
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R has a JSON package

Named rjson, appropriately. It’s quite basic just now, but contains methods for interconversion between R objects and JSON. Something like this: > library(rjson) > data <- list(a=1,b=2,c=3) > json <- toJSON(data) > json "{\"a\":1,\"b\":2,\"c\":3}" > cat(json, file="data.json") Use cases? I wonder if RApache could be used to build an API that serves R data in JSON format? Posted in

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Show me the mean(ing)…

November 5, 2009
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Show me the mean(ing)…

Well testing a bunch of samples for the largest population mean isn’t that common yet a simple test is at hand. Under the obvious title “The rank sum maximum test for the largest K population means” the test relies on the calculation of the sum of ranks under the combined sample of size , where

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