I have been working on developing some interactive tools for demonstrating statistical principles. The advent of the shiny framework for R from the RStudio team has made this very easy to do. These demos are still in the development...

At the time of the creation of this blog, Cronbach’s 1951 piece on coefficient alpha has 18,132 citations according to google scholar. The main use of coefficient alpha is to assess internal consistency reliability of a test or survey. Although it may have been forgotten, the proof Cronbach demonstrated established that coefficient alpha is the mean of all split...

For the introductory statistic student confidence intervals can seem a daunting concept to grasp. Quite simply put it is an interval that we have a certain measure of confidence that the population parameter falls into. The 95% confidence is the most common value chosen in my academic circle. Nevertheless, many others may be viable as well as long as...

Recently, I’ve started working on my website redesign, including the redesign of my research page. As somebody who works with different types of networks on (almost) daily basis, it would be easy to just create pretty network pictures and use … Continue reading →

Mike Bostock has revolutionized visualization with his d3 and his seemingly infinite examples. In another adaptation of his amazing work, I will adapt one of my favorite examples to supplement the interactive scatterplot with data supplied by R t...

The fine author Joe Cheng of RStudio Shiny suggested in this Google Groups message to use htmlOutput rather than the ugly hack in my last post R Shiny svg with no d3. As I should have known, it works great and eliminates all the useless javascrip...