How Not to Use Correlation Coefficients

This is a continuation of yesterday post. In this post https://irthoughts.wordpress.com/2007/11/20/a-pagerank-rank-correlation/ we discuss a study that claims a PageRank-Rank correlation. The … More

Spearman and Pearson Correlation Coefficients

New Relevant Tool: https://irthoughts.wordpress.com/2018/09/14/regression-correlation-calculator-updates-and-improvements/ I’ve been asked to explain the difference between Spearman (S) and Pearson (P) Correlation Coefficients. Good … More

I received yesterday an email from Dr. Ellen Voorhees, Chair, TREC Program Committee, informing us of the new track proposal … More

Hackers that market themselves are fully getting into the crime scene. We have seen marketers getting into hacking and vice … More

Dictionary defense definition lovers, here is one for you: misnomer. According to Dictionary.com, a misnomer is: 1. a misapplied or … More

Often independent events are mistaken for exclusive (disjoint) events. These are two different animals. Consider two events, A and B. … More

This is a continuation of yesterday’s post on Search Interface Usability. This time we want to touch upon visual clues and … More

Average search engine users don’t reformulate queries as we do in IR. They often recycle their query terms, using short … More

Claps We are happy to learn that Dr. Deepak Khemani from the Artificial Intelligence & Database Research Group at the … More

The current issue of IRW, Graduate Students Research, is out. It consists of short abstracts of research conducted by graduate … More