Monthly Archives: August 2011

(#ESA11) rOpenSci: a collaborative effort to develop R-based tools for facilitating Open Science

August 8, 2011
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(#ESA11) rOpenSci: a collaborative effort to develop R-based tools for facilitating Open Science

Our development team would like to announce the launch of rOpenSci. As the title states, this project aims to create R packages to make open science more available to researchers. http://ropensci.org/ What this means is t...

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Trading volume forecast for an illiquid stock

August 8, 2011
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Trading volume forecast for an illiquid stock

When dealing with transaction cost analysis, a stock’s volume is assumed to be stable or foreseeable.  However, there is different picture, then we are dealing with an illiquid stock. It is relatively easy to forecast the volume of a liquid stock, because trading volume has high autocorrelation – the volumes at t and t+1 are correlated. For

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R at Wikimania

August 8, 2011
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Wikimania 2011 came to a close yesterday. For those of you unfamiliar with Wikimania it may be described as UseR for Wikipedia, Wikimedia and MediaWiki all rolled into one. The conference brings together staff, volunteer editors, volunteer developers and users of MediaWiki projects. Of specific interest to R Bloggers readers may be the sessions on…

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RghcnV3 2.0

August 7, 2011
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RghcnV3 2.0

Well, version 2.0 is in the can and I’ll be uploading to CRAN over the next couple of days. Lets go over the highlights. Prior to version 2.0 we had basically 3 kinds of data flowing around the package: V3 14 column format, zoo objects and mts objects.  The 14 column format has always been

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Meta-analysis

August 7, 2011
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Meta-analysis

Introduction Effect estimation is an important task in modern research. An example is the identification of risk factors for disease and the qualification of medical treatments. Usually, researchers are interested in estimating the global, common effect. Since actual effects tend to differ across populations, estimates based on sample of a particular population seldomly generalize well.

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Usability

August 7, 2011
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Usability. I am not an expert in Human-Computer Interaction (HCI) at all. Worse, I make the crappiest looking interfaces, typically. So, that's said. Usability. Wikipedia writes that "sability is the ease of use and learnability of a ...

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R popularity – steady growth and New York Times

August 6, 2011
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R popularity – steady growth and New York Times

I have just came up with an idea how to test the wikipedia search traffic visualisation functions that I wrote about in my previous post. I decided to check if R is really gaining popularity that fast. ar <- wikiStat("R_(programming_language)", … Continue reading →

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Fitting mixture distributions with the R package mixtools

Fitting mixture distributions with the R package mixtools

My last two posts have been about mixture models, with examples to illustrate what they are and how they can be useful.  Further discussion and more examples can be found in Chapter 10 of Exploring Data in Engineering, the Sciences, and Medicine.  One important topic I haven’t covered is how to fit mixture models to datasets like the Old Faithful geyser...

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Visualising Wikipedia search statistics with R

August 6, 2011
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Visualising Wikipedia search statistics with R

I have been playing with R to parse html. After reading about visualising “fantasy football” search traffic with RGoogleTrends at The Log Cabin blog I decided to write a few functions to do similar things with Wikipedia search statistics. This … Continue reading →

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Programmers Should Know R

August 6, 2011
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Programmers Should Know R

Programmers should definitely know how to use R. I don’t mean they should switch from their current language to R, but they should think of R as a handy tool during development.Again and again I find myself working with Java code like the following. td.linenos { background-color: #f0f0f0; padding-right: 10px; } span.lineno { background-color: #f0f0f0; Related posts:

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