Paul Meagher is a cognitive scientist whose graduate studies focused on mathematical problem solving. Paul runs a Web development company called Datavore Productions, does freelance writing, and blogs at the open source site PHPMath.com.
Calculating Entropy for Data Miners
Publish Date: Mar. 24, 2005
Quick--what's the relationship between the columns of your database? Don't know? Maybe it's time to pull out the information theory book and calculate how much data they store. Paul Meagher explains how this works while showing off premade PHP libraries to handle the details of the calculations for you.
Calculating Entropy for Data Mining
Publish Date: Jan. 6, 2005
Eww, statistics. Right? Not necessarily--for example, calculating the entropy of your web statistics can help you analyze trends and correlations. Paul Meagher demonstrates statistical programming in PHP while explaining single-variable entropy.
ANOVA Statistical Programming with PHP
Publish Date: Jul. 22, 2004
Data miners and researchers often have to review their work for statistical variances. The Analysis of Variance (ANOVA) technique is a popular and effective way to gauge the effects of an experiment. Paul Meagher demonstrates how to use PHP, MySQL, and JpGraph for productive data-mining work.
© 2013, O’Reilly Media, Inc.
All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners.