Any good stats book has to cover a bit of basic probability. That's the purpose of Chapter 5 of Using R for Introductory Statistics, starting with a few definitions: Random variable A random number drawn from a population. A random variable is ...

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This my first post in 2011. this post has cost me a bit more than usual, but I hope it meets expectations. The aim of this tutorial is to generate an algorithm based on black box trading, with all the necessary elements for evaluation. That is a first post of several, in order to explore the problems, features of...

The CRANberries service (which reports on new and updated CRAN packages for the R language and environment) is now tweeting about new packages. Simply follow @CRANberriesFeed to receive theses messages. For the technically minded, adding this to the...

A regular expression allows you to do a moderately fancy search (and replace if you want). So say you wanted to replace all the "Dennis"s in a variable with "Awesome"s, but only if they're at the end of the line. You could try:-replace PBFnamevar = r...

On the first article, we saw a quick-and-dirty method to predict disk space exhaustion when the usage pattern is rigorously linear. We did that by importing our data into R and making a linear regression. In this article we will see the problems with that method, and deploy a more robust solution. Besides robustness, we will also see how we can generate...