October 2012

Regime Detection

October 31, 2012 | systematicinvestor

Regime Detection comes handy when you are trying to decide which strategy to deploy. For example there are periods (regimes) when Trend Following strategies work better and there are periods when Mean Reversion strategies work better. Today I want to show you one way to detect market Regimes. To detect ... [Read more...]

More data apps spawned by Sandy

October 31, 2012 | David Smith

As the clean-up continues on the eastern seaboard, I wanted to follow up on Monday's post on tracking Hurricane Sandy with Open Data with a couple of other R-based data applications spawned by the storm. Josef Fruehwald created an R script to tap into local weather sensors to keep track ... [Read more...]

draw figures in CMYK mode in R

October 31, 2012 | Xianjun Dong

Print publication usually ask to use CMYK (instead of RGB) color mode for figures (because not every color can be print out), while we usually use RGB for screen reading (because screen has larger range of color scale). Of course we can convert RGB to ... [Read more...]

Hierarchical linear models and lmer

October 31, 2012 | Ben Ogorek

Hierarchical linear models and lmer Article by Ben Ogorek Graphics by Bob Forrest Background My last article [1] featured linear models with random slopes. For estimation and prediction, we used the lmer function from the lme4 package[2]. Today we'll consider another level in the hierarchy, one where slopes and intercepts are ... [Read more...]

GGtutorial: Day 3 – Introduction to Colors

October 31, 2012 | is.R()

So, where does ggplot get its colors? If you’ve ever asked ggplot to color on the basis of a factor, you might have beeen surprised by the default color choices.  The fact is, ggplot colors factors on the basis of finding evenly spaced colors a... [Read more...]

Fitting Distributions to Data with R

October 31, 2012 | emraher

In “Fitting Distributions with R” Vito Ricci writes; “Fitting distributions consists in finding a mathematical function which represents in a good way a statistical variable. A statistician often is facing with this problem: he has some observations of a quantitative character and he wishes to test if those observations, being ... [Read more...]

Makefiles for R/LaTeX projects

October 30, 2012 | Rob J Hyndman

Updated: 21 November 2012 Make is a marvellous tool used by programmers to build software, but it can be used for much more than that. I use make whenever I have a large project involving R files and LaTeX files, which means I use it for almost all of the papers I ... [Read more...]

visit to ISU

October 30, 2012 | xi'an

  A short visit to ISU but and therefore a busy and proftable day! About ten appointments in Snedecor Hall after a nice morning run, a highly attended Zyskind Lecture, and many interesting discussions all over the day: e.g., I had a great time discussing using null recurrent Markov chains ... [Read more...]

Make your data famous!

October 30, 2012 | richierocks

I’m writing a book on R for O’Reilly, and I need interesting datasets for the examples. Any data that you provide will get you a mention in the book and in the publicity material, so it’s a great opportunity to publicise your work or your organisation. Datasets ... [Read more...]

Speed up R by using a different BLAS implementation

October 30, 2012 | f3lix

It is no news that R’s default BLAS is much slower that other available BLAS implementations. In A trick to speed up R matrix calculation/ Yu-Sung Su recommends using the ATLAS BLAS which is available on CRAN. When I learned about the possible speed-up  a while ago I tried ... [Read more...]

Happy SAP HANA Friends

October 30, 2012 | Alvaro "Blag" Tejada Galindo

This is a presentation that I did on the Community Theatre at SAP TechEd Las Vegas 2012. Happy sap hana friends from Alvaro Tejada In this presentation, Blagbert helps his friends Nerdbert to set up his first SAP HANA project using different technol... [Read more...]

"Advanced R" Course – November 15-16, 2012

October 30, 2012 | Milano R net

This is the last post about the course. As places are limited, please register as soon as possible! Milano R net, in collaboration with Quantide, organizes "Advanced R" Course November 15-16, 2012 Course description This course is designed for those … Continue reading → [Read more...]
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