The table function in R is very useful, especially when working with survey data. Often you may have Likert scales for levels of agreement or satisfaction. table() quickly gives the distribution of answers, which can then be used for (bar)plots.However...
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Le Monde puzzle [1]
![Le Monde puzzle [1]](http://feeds.wordpress.com/1.0/comments/xianblog.wordpress.com/8748/)
Following the presentation of the first Le Monde puzzle of the year, I tried a simulated annealing solution on an early morning in my hotel room. Here is the R code, which is unfortunately too rudimentary and too slow to be able to tackle n=1000. #minimise \sum_{i=1}^I x_i #for 1\le x_i\le 2n+1, 1\e i\le I 
Seasonal pair trading
quanttrader.info is a good quantitative repository, where I found an idea about seasonal spreads play. The idea of seasonal pair trading differs from pairs trading in a way, that it doesn’t try to find deviation from the spread’s mean, but it looks at seasonal spread patterns. In some cases it is easier to find an
Abusing Amazon’s Elastic MapReduce Hadoop service… easily, from R
JD Long's experimental segue package makes it easy to use Amazon's Elastic MapReduce service to fire up a Hadoop cluster and use it for non-Big Data, computationally-intensive tasks. The package provides a cluster-aware version of lapply() which "just works".
Install R Packages wherever needed
I frequently occupy computers everywhere with extensive MCMC tasks. Installing R doesn't take long, but it can be very annoying if you manually have to install dozens of R packages before your code is able to run. Well, now I use the following command ...
Install R Packages wherever needed
I frequently occupy computers everywhere with extensive MCMC tasks. Installing R doesn't take long, but it can be very annoying if you manually have to install dozens of R packages before your code is able to run. Well, now I use the following command ...
General-purpose MCMC draw saver for R
If you do MCMC with R, you probably know how nasty "bookkeeping" of draws can be. So I quickly coded up a small function which does everything for you. Every parameter has to begin with "mcmc_" or another to-be-defined string, then just run mcmcsave...
General-purpose MCMC draw saver for R
If you do MCMC with R, you probably know how nasty "bookkeeping" of draws can be. So I quickly coded up a small function which does everything for you. Every parameter has to begin with "mcmc_" or another to-be-defined string, then just run mcmcsave...
EmEditor R code macro – Almost interactive R development for Emeditor
Get the new macro now hosted on githubEdit 18th Jan 2011: The below text refers to the old version of the macro and is no longer relevant, a new post will describe the new macro, and it is also documented on the github site.As a follow ...
Using R for Introductory Statistics, Chapter 4, Model Formulae
Several R functions take model formulae as parameters. Model formulae are symbolic expressions. They define a relationship between variables rather than an arithmetic expression to be evaluated immediately. Model formulae are defined with the tilde ope...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
