This article describes the analysis of regression-discontinuity designs (RDDs) using the R packages rdd, rdrobust, and rddtools. We discuss similarities and differences between these packages and provide directions on how to use them effectively. We use real data from the Carolina Abecedarian Project to show how an analysis of an RDD can be…

In the age of self-checkout machines and entire television networks devoted to do-it-yourself home improvement projects, the DIY ethic seems to be around to stay. The desire to be self-sufficient and use one's time more efficiently is hard to pass up, especially for busy academic librarians. This column is devoted to resources that not only…

Discusses the concept and characteristics of artificial intelligence software for information retrieval, news filtering, clerical support, personal shopping, and investment counseling. Research projects on artificial intelligence at six academic institutions and examples of nine retrieval agent software packages are highlighted. Sidebars discuss…

This paper describes the highlights of a review of both commercially available videodiscs and research prototypes that was undertaken for the Interactive Videodisc Project, and sets out design principles suggested by the best examples, which take advantage of the unique characteristics of laser videodisc technology. Design options on three levels…

Gives an overview of Educational Support Systems based on commercial off-the-shelf software (ESSCOTS), and discusses the benefits of developing such educational software. Presents results of a study that revealed the learning processes of middle and high school students who used a geographical information system. (JMV)