Rise to the Challenge or Not Give a Damn: Differential Performance in High vs. Low Stakes Tests

This paper studies how different demographic groups respond to incentives by comparing performance in the GRE examination in "high" and "low" stakes situations. The high stakes situation is the real GRE examination and the low stakes situation is a voluntary experimental section of the GRE that examinees were invited to take immediately after they finished the real GRE exam. We show that males exhibit a larger difference in performance between the high and low stakes examinations than females, and that Whites exhibit a larger difference in performance between the high and low stakes examinations relative to Asians, Blacks, and Hispanics. We find that the larger differential performance between high and low stakes tests among men and whites can be partially explained by the lower level of effort invested by these groups in the low stake test.gender, competition, incentives, GRE, high stakes, low stakes, test score gap

Rise to the challenge or not give a damn: Differential performance in high vs. low stakes tests

This paper studies how different demographic groups respond to incentives by comparing performance in the GRE examination in high and low stakes situations. The high stakes situation is the real GRE examination and the low stakes situation is a voluntary experimental section of the GRE that examinees were invited to take immediately after they finished the real GRE exam. We show that males exhibit a larger difference in performance between the high and low stakes examinations than females, and that Whites exhibit a larger difference in performance between the high and low stakes examinations relative to Asians, Blacks, and Hispanics. We find that the larger differential performance between high and low stakes tests among men and whites can be partially explained by the lower level of effort invested by these groups in the low stake test

Schrijver graphs and projective quadrangulations

In a recent paper [J. Combin. Theory Ser. B}, 113 (2015), pp. 1-17], the authors have extended the concept of quadrangulation of a surface to higher dimension, and showed that every quadrangulation of the $n$-dimensional projective space $P^n$ is at least $(n+2)$-chromatic, unless it is bipartite. They conjectured that for any integers $k\geq 1$ and $n\geq 2k+1$, the Schrijver graph $SG(n,k)$ contains a spanning subgraph which is a quadrangulation of $P^{n-2k}$. The purpose of this paper is to prove the conjecture

Dancing in the Streets - a design case study

How do you transform a city center at night to enhance the experience of residents and visitors and to combat the public’s fears over safety and security after dark? This challenge was set by the York City Council’s “Renaissance Project: Illuminating York,” and we took them up on it. We made it our goal to get pedestrians to engage with our interactive light installation—and to get them dancing without even realizing it. People out shopping or on their way to restaurants and nightclubs found themselves followed by ghostly footprints, chased by brightly colored butterflies, playing football with balls of light, or linked together by a “cat’s cradle” of colored lines. As they moved within the light projections, participants found that they were literally dancing in the street

An integrated development environment for Java Card

This article describes a Java Card programming environment which to a large extent is generated from formal specifications of the syntax and semantics of Java Card, the Java Card Runtime Environment (JCRE), and the Java Card APIs. The resulting environment consists of a set of tightly integrated and somewhat smart tools, such as a Java-specific structure editor and a simulator which allows an application to be tested before being downloaded to a card. Furthermore, the simulator analyses the applet in question in order to find out the structure of the accepted commands. This information is then used to automatically adapt the GUI of the simulator

Calculating the random guess scores of multiple-response and matching test items

For achievement tests, the guess score is often used as a baseline for the lowest possible grade for score to grade transformations and setting the cut scores. For test item types such as multiple-response, matching and drag-and-drop, determin-ing the guess score requires more elaborate calculations than the more straight-forward calculation of the guess score for True-False and multiple-choice test item formats. For various variants of multiple-response and matching types with respect to dichotomous and polytomous scoring, methods for determining the guess score are presented and illustrated with practical applications. The implica-tions for theory and practice are discussed

Recognizing shrinkable complexes is NP-complete

International audienceWe say that a simplicial complex is shrinkable if there exists a sequence of admissible edge contractions that reduces the complex to a single vertex. We prove that it is NP-complete to decide whether a (three-dimensional) simplicial complex is shrinkable. Along the way, we describe examples of contractible complexes which are not shrinkable