October 2011

Halloween 2011 count

October 31, 2011 | Karl Broman

We don’t get many kids seeking candy at our house. I’m not sure if there just aren’t many kids in the neighborhood, or if it’s our location (next to the pond, with a big gap before the next house). I decided to keep track. As usual, ... [Read more...]

Covered Call ETF Performance

October 31, 2011 | The Average Investor

Covered call ETFs have become quite popular lately. Living in Canada, I have been holding a couple Canadian members of this family for the last few months. When I purchased them, I liked the benefits and since I wasn’t expecting any bull markets on the horizon, I bought some. ... [Read more...]

Putting the R in Hallowe’en

October 31, 2011 | David Smith

PhD student Caroline Tucker created a Hallowe'en card using the R graphics system: You can find the R code to create the above image here. Note that you'll need to install the fields and MBA packages first. One interesting aspect of the code is the use of the mba.surf ... [Read more...]

Using Sparse Matrices in R

October 31, 2011 | John Myles White

Introduction I’ve recently been working with a couple of large, extremely sparse data sets in R. This has pushed me to spend some time trying to master the CRAN packages that support sparse matrices. This post describes three of them: the Matrix, slam and glmnet packages. The first two ... [Read more...]

R 2.14.0 Released

October 31, 2011 | Dave Giles

A Halloween treat for R users! Version 2.14.0 was released today. Among other things there are big improvements for parallel processing. For a quick synopsis of the new "goodies", see the post on the Revolutions blog.© 2011, David E. Giles [Read more...]

Making R’s paste act more like CONCAT

October 31, 2011 | Jeremy Leipzig

While vector-friendly, R's paste function has a few behaviors I don't particularly like. One is using a space as the default separator:__ adjectives__ paste(adjectives,"er")__ paste(adjectives,"er")[1] "lean er" "fast er" "strong er" #d'oh__ paste(adjectives,"er",sep="")[1] "leaner" "faster" "stronger"Empty vectors get an undeserved first class ... [Read more...]

R 2.14.0 is released

October 31, 2011 | David Smith

As scheduled, the first release of the new R 2.14 series is now available for download in source code form. As of this writing, pre-compiled binaries for Windows, Linux and MacOS aren't yet available, but will appear on your local CRAN mirror in the next couple of days. One of the ... [Read more...]

R 2.14.0 is released!

October 31, 2011 | Paolo Sonego

The new R 2.14.0 is out! Get the source code from here. Take a look at these posts for some miscellaneous advices to make the upgrade easier. Also this thread on stackoverflow and this post contributed by Tal Galili&nbs...
[Read more...]
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