Some properties of generalized ridge estimators

Exact expressions, in the form of infinite series expansions, are given for the first and second moments of two well known generalized ridge estimators. These series expansions are then evaluated using recursive formulas and computations are verified using approximations. Results are presented for the relative mean square error and bias of these estimators as well as their relative efficiency with respect to least squares.     

Revising the standard wisdom of C. elegans natural history: ecology of longevity

Here, we consider that most of the research concerning Caenorhabditis elegans has been laboratory focused and that only limited research has directly considered the worm's biology relative to its natural history in the wild. We describe that, although the worm has traditionally been considered a soil nematode, we could not find it in soil but frequently recovered it from snails. Finally, we discuss how a better understanding of the natural history of C. elegans may enhance its usefulness as a model organism for studying aging and other phenomena.     

Time for change

ABSTRACT

This introductory article sets out the core concerns of this special issue on time and temporality in relation to social movements. It examines three areas: historical times, events, and sequences. In each area, we examine the ways that time and temporality are (often implicitly) embedded in existing social movement scholarship. We then introduce some of the problems raised by our contributors, and the ways in which they utilise greater sensitivity to time and temporality in furthering our understanding of the dynamics of the mobilisation, functions and fortunes of social movements.