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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.
