2157 search results for "twitter"

Connecting to a MongoDB database from R using Java

September 24, 2010
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Connecting to a MongoDB database from R using Java

It would be nice if there were an R package, along the lines of RMySQL, for MongoDB. For now there is not – so, how best to get data from a MongoDB database into R? One option is to retrieve JSON via the MongoDB REST interface and parse it using the rjson package. Assuming, for

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Effective sample size

September 23, 2010
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Effective sample size

In the previous days I have received several emails asking for clarification of the effective sample size derivation in “Introducing Monte Carlo Methods with R” (Section 4.4, pp. 98-100). Formula (4.3) gives the Monte Carlo estimate of the variance of a self-normalised importance sampling estimator (note the change from the original version in Introducing Monte

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Global done!

September 23, 2010
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Global done!

Over the past few weeks I’ve been working at getting Moshtemp to work entirely in the raster package. I’ve been aided greatly by the author of that package, Robert, who has been turning out improvements to the package with regularity. For a while I was a bit stymied by some irregularities in getting source from

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Monte Carlo Statistical Methods third edition

September 23, 2010
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Monte Carlo Statistical Methods third edition

Last week, George Casella and I worked around the clock on starting the third edition of Monte Carlo Statistical Methods by detailing the changes to make and designing the new table of contents. The new edition will not see a revolution in the presentation of the material but rather a more mature perspective on what

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R tee-shirt

September 21, 2010
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R tee-shirt

I gave my introduction to the R course in a crammed amphitheatre of about 200 students today. Had to wear my collectoR teeshirt from Revolution Analytics, even though it only made the kids pay attention for about 30 seconds… The other few “lines” that worked were using the Proctor & Gamble “car 54″ poster and

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Saptarshi Guha on Hadoop, R

September 20, 2010
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Saptarshi Guha (author of the Rhipe package) joins the likes of Ebay, Yahoo, Twitter and Facebook and as one of just 37 presenters at the Hadoop World conference. (Revolution Analytics is proud to sponsor Saptarshi's presence at this event, which take place in New York on October 12.) He'll be talking about using R and Hadoop to analyze Voice-over-IP...

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In case you missed it: August Roundup

September 20, 2010
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In case you missed them, here are some articles from August of particular interest to R users. We noted that R had a key role in the US government's reaction to the BP oil spill, as related by the Statistical Engineering division chief at NIST. We linked to an example of creating an animation in Google Earth based on...

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How fast is JAGS?

September 20, 2010
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How fast is JAGS?

The OpenBUGS development team have created some validation code called WinComp that allows the results of OpenBUGS to be compared with WinBUGS 1.4 for all the examples in the OpenBUGS manual.  I have wrapped up this code into an R … Continue reading →

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Installing ‘intergraph’ package

September 17, 2010
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Installing ‘intergraph’ package

After some e-mails I decided to put together a bit more detailed instruction how to install the ‘intergraph’ package together with the namespaced version of the ‘network’ package. See here. There seemed to be some problems with downloading the namespaced ‘network’ from my webstite (thanks Neil!). File permissions were set incorrectly. I fixed that and

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Typo in Example 3.6

September 16, 2010
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Typo in Example 3.6

Edward Kao pointed out the following difficulty about Example 3.6 in Chapter 3 of “Introducing Monte Carlo Methods with R”: I have two questions that have puzzled me for a while. I hope you can shed some lights. They are all about Example 3.6 of your book. 1. On page 74, there is a term

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