Paul Meagher wrote in to tell us about a new article of his over on the IBM DeveloperWorks section - Conduct Web experiments using PHP: Part 2.

In the first article in this two-part series, I discussed the implementation of Web offer quality control experiments. In the second article, I focus on simulating and analyzing the data arising from such experiments.

Readers might also be interested in downloading the new collection of database-aware chi-square test procedures (CHI Package) and the updated probability distributions library (PDL Package) that accompany the article. They can be used in many more contexts that are discussed in this article series.