Monthly Archives: October 2011

RStudio Update

October 27, 2011
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RStudio Update

With R 2.14 slated to be released next week we wanted to encourage everyone planning to upgrade to also update to the latest release of RStudio (v0.94.110). For R 2.14 users this release includes tweaks related to compatibility with the R 2.14 graphics engine as well as compatibility with the new parallel package. There are

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Two new rOpenSci R packages are on CRAN

October 27, 2011
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Two new rOpenSci R packages are on CRAN

Carl Boettiger, a graduate student at UC Davis, just got two packages on CRAN.  One is treebase, which which handshakes with the Treebase API.  The other is rfishbase, which connects with the Fishbase, although I believe just scrapes XML cont...

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Computing on the Language

October 27, 2011
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And now for something a bit more esoteric…. I recently wrote a function to deal with a strange problem. Writing the function ended up being a fun challenge related to computing on the R language itself. Here’s the problem: Write a function that tak...

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Introduction to “Numerical Methods and Optimization in Finance”

October 27, 2011
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Introduction to “Numerical Methods and Optimization in Finance”

The book is by Manfred Gilli, Dietmar Maringer and Enrico Schumann.  I haven’t actually seen the book, so my judgement of it is mainly by the cover (and knowing the first two authors). The parts of the book closest to my heart are optimization, particularly portfolio optimization, and particularly particularly portfolio optimization via heuristic algorithms.  … Continue reading...

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R Cookbook with examples

October 27, 2011
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R Cookbook with examples

An R Cookbook can be found at http://code.ca-net.org/R%20Cookbook. It is a short web document presenting dozens of examples on - Accessing Database with packages RSQLite, RMySQL, RdbiPgSQL and RODBC; - Reading and Writing Data; - Date/Time variable; - Graphics; - … Continue reading →

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Shoe Consumption in the U.S. – GGPlot2 #1

October 26, 2011
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Shoe Consumption in the U.S. – GGPlot2 #1

  This is the first in a series of blog posts in which I use the R package GGPlot2 to examine real world data. In this post, I construct a line graph of U.S. shoe consumption from 1995 to 2007. A recent survey conducted by Shop Smart magazine found that the average woman in the

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Netflix Post-mortem – How to detect Bubbles

October 26, 2011
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Netflix Post-mortem – How to detect Bubbles

Bubbles. I’m no expert in behavioral economics, but bubbles seem to be well understood (after they occur) although they seem hard to detect (at least in the eyes of outsiders and late bubble participants). This post won’t tell you how to avoid bubbles, but might give you some insight. I came across Minsky’s explanation of

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Mixed-Effects Models in R with Quantum Forest

October 26, 2011
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For anyone who wants to estimate linear or nonlinear mixed-effects models (aka random-effects models, hierarchical models or multilevel models) using the R language, the Quantum Forest blog has several recent posts that will be of interest. Written by Luis Apiolaza from the School of Forestry at the University of Canterbury in New Zealand, the blog includes a number of...

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What do your rules look like? editrules 1.8-x answers with the help of igraph

October 26, 2011
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What do your rules look like? editrules 1.8-x answers with the help of igraph

We (Edwin de Jonge and me) have recently updated our editrules package. The most important new features include (beta) support for categorical data. However, in this post I'm going to show some visualizations we included, made possible by Gabor Csardi's … Continue reading →

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How to display R code on a web page

October 26, 2011
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Starting to write a blog I need a way how to publish my R codes. One possibility would be to just add some formatting with Pretty R. Nice, but I miss a repository with all codes ever submitted and possibility to make corrections.The final solution was ...

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