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Aggregate Function in R: Making your life easier, one mean at a time

April 20, 2011 | hayward

I previously posted about calculating medians using R. I used tapply to do it, but I’ve since found something that feels easier to use (at least to me). ?Download download.txt1 2 3 aggregated_output = aggregate(DV ~ IV1 * IV2, data=data_to_aggregate, FUN=median) aggregated_output The above code saves ... [Read more...]

RStudio, Revolution Analytics and Deducer: A Tale of Three GUIs

April 19, 2011 | hayward

I’m in the process of moving from SPSS to R at the moment. It’s not been the easiest of rides, but then learning how to do a core part of your job never really should be. It’s been fun, though – don’t get me wrong – it’s ... [Read more...]

Pivot Tables and Medians in R

April 16, 2011 | hayward

Pivot Tables are a useful way of aggregating data into the format that you’re after. In this example, I’m going to be using R to pivot some data and calculate medians for me. This is useful because Excel can calculate medians (the =MEDIAN(values)) function, but what it ... [Read more...]

From one extreme (0) to another (1): challenge failed, but who cares…

January 9, 2011 | arthur charpentier

Just after arriving in Montréal, at the beginning of September, I discussed statistics of my blog, and said that it might be possible - or likely - that by new year's Eve, over a million page would have been viewed on my blog (from Google's count...

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web content anlayzer

January 6, 2011 | Martin Scharm

Just developed a small crawler to check my online content at binfalse.de in terms of W3C validity and the availability of external links. Here is the code and some statistics... [Read more...]

Blog year 2010 in review

December 30, 2010 | Pat

The blog year started in August and consists of 30-something posts. Here is a summary. Quant concepts backtesting: Backtesting — almost wordless cointegration: American TV does cointegration efficient frontier: Anomalies meet volatility implied alpha: Implied alpha — almost wordless portfolio theory: Ancient portfolio theory random walk: The tightrope of the random walk ...

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Another boring blog

December 2, 2010 | Daniel Hocking

I recently decided to create two blogs as outlets for my research. The first (The Richness of Life) focuses more on the organisms I work with as an ecologist and my general interest as a student of natural history. This blog on Quantitative...

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A million ? what are the odds…

October 27, 2010 | arthur charpentier

50 days ago, I published a post, here, on forecasting techniques. I was wondering what could be the probability to have, by the end of this year, one million pages viewed (from Google Analytics) on this blog. Well, initially, it was on my blog at t... [Read more...]

Welcome Rumpel!

October 18, 2010 | Martin Scharm

Ladies and gentlemen, waiting is finally over. I'm proud to introduce Rumpel! [Read more...]

Blogging about R – presentation and audio

July 28, 2010 | Tal Galili

At the useR!2010 conference I had the honor of giving a (~15 minute) talk titled “Blogging about R”. The following is the abstract I submited, followed by the slides of the talk and the audio file of a recording I made of the talk (I am sad it got a bit ... [Read more...]

hash-2.0.0

April 30, 2010 | Christopher Brown

Come see my talk on hashes in R at useR! 2010. (http://user2010.org/) July 20-23 National Institute of Standards and Technology (NIST), Gaithersburg, Maryland, USA [Read more...]

R : NA vs. NULL

April 25, 2010 | Christopher Brown

The R language has two closely related NULL-like values, NA and NULL ... Both are used to represent missing or undefined values. This has lead to much confusion. [Read more...]

An article attacking R gets responses from the R blogosphere – some reflections

April 16, 2010 | Tal Galili

In this post I reflect on the current state of the R blogosphere, and share my hopes for the future [Read more...]

R-bloggers (with ~50 blogs) has just crossed the 1000 subscribers mark!

March 3, 2010 | Tal Galili

<img src=' [Read more...]

hash-1.99.x

February 17, 2010 | Christopher Brown

hash-2.0.0 has been released please read about it here: Earlier today, hash-1.99.x was released to CRAN. This is a stable release and adds some more functions to an already full-featured hash implementation. This version fixes some bugs, adds some features, improves performance and stability. You can read about the ... [Read more...]

Announcing R-bloggers.com: a new R news site (for bloggers by bloggers)

December 9, 2009 | Tal Galili

I already wrote about R-bloggers on the R mailing list, so it only seems fitting to write about it more here. I will explain what R-bloggers is and then move to explain what I hope it will accomplish. R-Bloggers.com is a central hub of content collected from bloggers who ... [Read more...]

R information

December 4, 2009 | Shige

http://romainfrancois.blog.free.fr/index.php?

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[, [[, $: R accessors explained

October 21, 2009 | Christopher Brown

For more than ten years, I have been teaching R both formally and informally. One thing that I find often trips up students is the use of R’s accessors and mutators. ( For those readers not from a formal computer science background, an accessor is a method for accessing data ...

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R: The Dummies Package

September 30, 2009 | Christopher Brown

R-2.9.2 was released in August. While R can be considered stable and battle-ready, it is also far from stagnation. It is humbling to see such an intelligent and vibrant community helping CRAN grow faster than ever. Every day I see a new package or read a new comment on R-Help [...] [Read more...]

One R tip a day

June 21, 2008 | Michal

I just encountered this website http://onertipaday.blogspot.com/: One R tip per day. Very nice collection of R tips. [Read more...]

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