July 2012

Universal portfolio, part 9

July 25, 2012 | Orval

Part 8 was discussing the distribution of the absolute wealth of the Universal Portfolio across all possible tuples of length 2, 3 and 4.However, comparing the absolute wealth against some reference, especially against simple portfolio selection algor... [Read more...]

Another R mention in the NYT

July 25, 2012 | David Smith

The R language gets a brief mention in an article in yesterday's New York Times on automated bond trading: The traders here are mostly educated in math or physics, often outside the United States, and their desks are piled high with textbooks like the “R Graphs Cookbook,” for working with ... [Read more...]

Revolution Newsletter: July 2012

July 25, 2012 | David Smith

The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full July edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Quick Start Program for Hadoop: ... [Read more...]

Long-vector kludge in R

July 25, 2012 | Christopher Bare

Just recently, I found out that R is limited to 32-bit integers, even on 64-bit hardware. Bummer, huh? As a consequence, the maximum size of a vector is 2^31-1. To be fair, dealing with numeric types across machine architectures is hard. A fixed repr...
[Read more...]

The housing bubble: Where are we?

July 25, 2012 | dan

Last spring we looked at the state of the housing bubble in the US. The question of readers' minds then was "where is it going next"? It's been more than a year, so let's have a look, above. The post The housing bubble: Where are we? appeared first on Decision ... [Read more...]

Learning R has really made me appreciate SAS

July 25, 2012 | Randy Zwitch

For the past 18 months, it seems like all I’ve heard about in the digital marketing industry is “big data”, and with that, mentions of using Hadoop and R to solve these sorts of problems.  Why are these tools the … Continue reading →Learning R has really made me appreciate SAS ... [Read more...]

Really Big Objects Coming to R

July 25, 2012 | rdpeng

I noticed in the development version of R the following note in the NEWS file: There is a subtle change in behaviour for numeric index values 2^31 and larger.  These used never to be legitimate and so were treated as NA, sometimes with a warning. [Read more...]

RcppClassic 0.9.2

July 24, 2012 | Thinking inside the box

Similar to yesterday's post about RcppGSL, we have another pure maintenance release to announce, this time of RcppClassic, the package supporting the deprecated older classic Rcpp API defined in the earlier 2005 to 2006 releases, is now on CRAN. Ther... [Read more...]

Civic Data Challenge closes July 29

July 24, 2012 | David Smith

There's only a few days left to enter the Civic Data Challenge: entries are due before midnight EST on July 29 to qualify for the $100,000 in prizes. The competition, open to US residents, challenges particpants to applications and visualizations from civic health data. Prizes will be awarded by a panel of ... [Read more...]

What’s wrong with LOESS for palaeo data?

July 24, 2012 | ucfagls

Locally weighted scatterplot smoothing (LOWESS) or local regression (LOESS) is widely used to highlight “signal” in variables from stratigraphic sequences. It is a user-friendly way of fitting a local model that derives its form from the data themselves rather than having … Continue reading → [Read more...]

Williams designs with 5 products

July 24, 2012 | Wingfeet

In a previous post I created small Williams designs for an even number of products. This worked very well, also because the number of permutations could be restricted significantly due to symmetry. Unfortunately this does not work so well with an odd n...
[Read more...]
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