Final Regression Results on the Cognitive Achievement of Children in the Christchurch Health and Development Study with Corrections for Attrition from this Longitudinal Study

Econometric analyses of the cognitive development of children have been hampered by data limitations and a variety of methodological and specification issues. Structural models allow for complex causal relationships between child achievement and inputs from parents, schools and communities, but these effects are difficult to isolate. Even reduced-form models suffer from both omitted-variable (e.g., unobserved family and community investments) and simultaneous-equation bias (e.g., endogenous private schooling and class size). The use of panel data offers the best non-experimental solution to these estimation issues. With multiple observations on test performance of children between the ages of 8 and 13 in the Christchurch Health and Development Study, we are able to hold constant individual- specific, time-invariant factors that influence cognitive achievement. These data permit several insights into the dynamic nature of this cognitive achievement process. We cannot reject the null hypothesis that the lagged dependent variable serves as a “sufficient statistic” for all past determinants of cognitive achievement. This provides the first statistical justification for the “value-added approach” recommended of Hanushek (1986), and actually diminishes the need for these longer longitudinal studies. Procedures are developed for testing for the presence of unobserved fixed-effects in this cognitive development process, and correcting for the effects of attrition from this panel. No evidence is found that the value-added to cognitive achievement is influenced by the number of parents in the family, the work status of the mother, the benefit status of the family, the income of the family and the type of school attended. Evidence is also found of a positive effect of class size on cognitive development. Our interpretation is that class size is endogenous, and the causality may be reversed (i.e., children with poor reading performances are intentionally placed in smaller classes). Yet, no evidence is found of the hypothesised negative effect of class size on cognitive achievement with an anti- instrumental-variable approach.

Play and metaphor in clinical supervision: keeping creativity alive

This article explores the use of play and metaphor in clinical supervision. The intention is not to attempt to cover the whole area of play, or the use of metaphor in clinical supervision, but rather to highlight particular aspects of their respective roles in the service of learning about therapeutic work. The relevance of the arts - especially the visual arts - in relation to this is also discussed. A number of brief clinical vignettes are included by way of illustration. All names, and some identifying details, have been changed to preserve confidentiality. (C) 2010 Elsevier Inc. All rights reserved

Binary and Millisecond Pulsars at the New Millennium

We review the properties and applications of binary and millisecond pulsars. Our knowledge of these exciting objects has greatly increased in recent years, mainly due to successful surveys which have brought the known pulsar population to over 1300. There are now 56 binary and millisecond pulsars in the Galactic disk and a further 47 in globular clusters. This review is concerned primarily with the results and spin-offs from these surveys which are of particular interest to the relativity community.Comment: 59 pages, 26 figures, 5 tables. Accepted for publication in Living Reviews in Relativity (http://www.livingreviews.org

The association between birth weight and plasma fibrinogen is abolished after the elimination of genetic influences

Low birth weight is associated with an increased risk of atherothrombosis, which may be related in part to the association between low birth weight and high plasma fibrinogen. The association between birth weight and fibrinogen may be explained by intrauterine, socio-economic or genetic factors. We examined birth weight and fibrinogen in 52 dizygotic and 56 adolescent monozygotic (genetically identical) twin pairs. The dizygotic but not the monozygotic twins with the lowest birth weight from each pair had a fibrinogen level that was higher compared with their co-twins with the highest birth weight [dizygotic twins: 2.62±0.46 g

Simpson's Paradox, Lord's Paradox, and Suppression Effects are the same phenomenon – the reversal paradox

This article discusses three statistical paradoxes that pervade epidemiological research: Simpson's paradox, Lord's paradox, and suppression. These paradoxes have important implications for the interpretation of evidence from observational studies. This article uses hypothetical scenarios to illustrate how the three paradoxes are different manifestations of one phenomenon – the reversal paradox – depending on whether the outcome and explanatory variables are categorical, continuous or a combination of both; this renders the issues and remedies for any one to be similar for all three. Although the three statistical paradoxes occur in different types of variables, they share the same characteristic: the association between two variables can be reversed, diminished, or enhanced when another variable is statistically controlled for. Understanding the concepts and theory behind these paradoxes provides insights into some controversial or contradictory research findings. These paradoxes show that prior knowledge and underlying causal theory play an important role in the statistical modelling of epidemiological data, where incorrect use of statistical models might produce consistent, replicable, yet erroneous results

A STUDY ON MARKETING OF MUSHROOM IN HARDOI DISTRICT OF UTTAR PRADESH

India’s biodiversity coupled with its vast resources including competitive workforce, highly intelligent scientific and rich business community make our country the best choice for growing vegetable crops like mushroom for world market. The field of mushroom crops is assuming importance because of growing demand for mushroom throughout the world. India is not a major producer of any particular variety of the mushroom, but it does cultivate mushrooms and has great potential as an important producer in the future. From a production standpoint, the white button mushroom has the highest growth rate and potential for production. However, the cultivation of oyster mushrooms has been more common since the end of the last century, when the infrastructure of oyster mushroom was much improved, therefore capital requirements went down as compared to requirements for white button mushroom cultivation

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6 x 10(20) protons on target

111 pages, 45 figures, submitted to Physical Review D. Minor revisions to text following referee comments111 pages, 45 figures, submitted to Physical Review D. Minor revisions to text following referee comments111 pages, 45 figures, submitted to Physical Review D. Minor revisions to text following referee commentsWe thank the J-PARC staff for superb accelerator performance and the CERN NA61/SHINE Collaboration for providing valuable particle production data. We acknowledge the support of MEXT, Japan; NSERC, NRC, and CFI, Canada; CEA and CNRS/IN2P3, France; DFG, Germany; INFN, Italy; National Science Centre (NCN), Poland; RSF, RFBR and MES, Russia; MINECO and ERDF funds, Spain; SNSF and SER, Switzerland; STFC, UK; and the U. S. Deparment of Energy, USA. We also thank CERN for the UA1/NOMAD magnet, DESY for the HERA-B magnet mover system, NII for SINET4, the WestGrid and SciNet consortia in Compute Canada, GridPP, UK, and the Emerald High Performance Computing facility in the Centre for Innovation, UK. In addition, participation of individual researchers and institutions has been further supported by funds from ERC (FP7), EU; JSPS, Japan; Royal Society, UK; and DOE Early Career program, USA