In probability and statistics, Simpson’s paradox is an apparent paradox in which a trend is present in different groups, but is reversed when the groups are combined. Joel Cohen (1986) has shown that continuously distributed lifetimes can never have a Simpson’s paradox. We investigate the same question for discrete random variables to see if a Simpson’s paradox is possible. With discrete random...

This paper outlines and analyses the behaviours of small and medium enterprises with respect to the evaluation of electronic commerce investments, and the subsequent realisation of the anticipated benefits from those investments. The responses of executives who participated in the study suggested that on-going involvement in electronic commerce did not come cheaply. Nonetheless, our study sugge...

by the decrease in incorporation of labelled methyl groups from enzymically synthesized S-adenosylmethionine into basic protein by spinal-cord protein methylase activity (Table 1). Electrophoresis of the labelled protein precipitate on acetic acidhrea-polyacrylamide gels (Deibler et al., 1972), followed by autoradiography of the gels, indicated that only the myelin basic protein was detectably ...

In recent times, games-based learning has been attracting the attention of educators around the world. One of the challenges in deploying games-based learning to cover a larger proportion of the curriculum is the high costs associated with development of the games. Games development often requires specialized skills sets. Inputs from academic specialists for the learning content and pedagogy is...

Peter Reddien attended graduate school at MIT in the lab of Bob Horvitz, studying programmed cell death in Caenorhabditis elegans. He carried out postdoctoral work with Alejandro Sánchez Alvarado at the University of Utah, where he performed the fi rst planarian RNA interference screen. He started his lab at the Whitehead Institute and the Department of Biology at MIT in 2005 and is an HHMI Inv...

We present a detailed analysis of the spatial structure of the ionospheric plasma velocity in the nightside Fregion ionosphere, poleward of the open-closed magnetic field line boundary (OCB), i.e. in regions magnetically connected to the turbulent solar wind. We make use of spatially distributed measurements of the ionospheric plasma velocity made with the Halley Super Dual Auroral Radar Networ...