Category Archives: Miscellaneous

Betweenness Centrality

Network graphs are interesting data structures. You can compute all kinds of metrics on a graph, including several measures of centrality. Centrality metrics indicate how important a node is in some way. Different centrality measures give you different information. Betweenness … Continue reading

Posted in Miscellaneous | Leave a comment

The 2018 Women’s World Chess Championship

A match for the women’s world chess championship is being played as I write this post. The two contestants are Zhongyi Tan, the current champion, and Wenjun Ju, the challenger. Both players are from China. The match is being played … Continue reading

Posted in Miscellaneous | 3 Comments

SAT Math Scores and Gender

I’ve taught at the high school and university levels, so I’m always interested in education. With the high school year coming to a close (in the U.S.) there’s interest in college admissions. Based on my experience, high school GPA and … Continue reading

Posted in Miscellaneous

Some Thoughts About the W3.CSS Library

The W3.CSS library is a free code library from the popular w3schools.com Web site (as opposed to the similarly named w3.org Web standards organization). The W3.CSS library wraps raw CSS primitives into easy-to-use abstractions, without using any JavaScript. For example, … Continue reading

Posted in Miscellaneous

An Exciting Day for American Chess

For the first time since Bobby Fischer in 1972, a player from the United States will compete for the world chess championship. American player Fabiano Caruana won the 2018 Candidates Tournament, and will challenge current world champion Magnus Carlsen, in … Continue reading

Posted in Miscellaneous | 2 Comments

Fleiss Kappa for Inter-Rater Reliability

Every time I serve on a conference committee and look at all the evaluations of the proposals or papers, I’m reminded that in those scenarios, there is very little agreement among the raters. For example, if a research paper is … Continue reading

Posted in Miscellaneous

The Kolmogorov-Smirnov Test Simple Example

The Kolmogorov-Smirnov (KS) test is a classical statistics technique that can be used to compare a set of observed values with a set of expected values, or compare a set of values with a known distribution. Suppose you have n … Continue reading

Posted in Miscellaneous