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Another Hypothesis (another + hypothesis)

Distribution by Scientific Domains

Life Sciences	40%

Selected Abstracts

The impact of operational characteristics on firms' EMS decisions: strategic adoption of ISO 14001 certifications

CORPORATE SOCIAL RESPONSIBILITY AND ENVIRONMENTAL MANAGEMENT, Issue 4 2010
Takuya Takahashi
Abstract Firms choose to seek environmental management system (EMS) certifications such as ISO 14001 for a variety of reasons. In this paper we put forward a hypothesis that firms seek ISO 14001 certifications for their establishments when their operations involve low degrees of complexity. Another hypothesis we consider is that firms facing more uncertainty in their operations (and hence more risk) seek ISO 14001 certifications. These hypotheses have not been yet addressed in the literature and are of particular interest to business managers and policymakers. We empirically test these hypotheses using probit and duration models using matched establishment,firm,industry data for large Japanese manufacturers. Our findings support the first as well as the second hypotheses. This suggests that firms tend to certify more routine and less complex operations first, and that firms use ISO 14001 certifications as an insurance scheme. Copyright © 2009 John Wiley & Sons, Ltd and ERP Environment. [source]

Genetic differences in growth of an invasive tree species

ECOLOGY LETTERS, Issue 6 2001
Evan Siemann
Invasive plants are often more vigorous in their introduced ranges than in their native ranges. This may reflect an innate superiority of plants from some habitats or an escape from their enemies. Another hypothesis proposes that invasive plants evolve increased competitive ability in their introduced range. We present the results of a 14-year common garden experiment with the Chinese Tallow Tree (Sapium sebiferum) from its native range (Asia), place of introduction to North America (Georgia) and areas colonized a century later (Louisiana and Texas). Invasive genotypes, especially those from recently colonized areas, were larger than native genotypes and more likely to produce seeds but had lower quality, poorly defended leaves. Our results demonstrate significant post-invasion genetic differences in an invasive plant species. Post-introduction adaptation by introduced plants may contribute to their invasive success and make it difficult to predict problem species. [source]

Sibling death clustering in India: state dependence versus unobserved heterogeneity

JOURNAL OF THE ROYAL STATISTICAL SOCIETY: SERIES A (STATISTICS IN SOCIETY), Issue 4 2006
Wiji Arulampalam
Summary., Data from a range of environments indicate that the incidence of death is not randomly distributed across families but, rather, that there is a clustering of death among siblings. A natural explanation of this would be that there are (observed or unobserved) differences across families, e.g. in genetic frailty, education or living standards. Another hypothesis that is of considerable interest for both theory and policy is that there is a causal process whereby the death of a child influences the risk of death of the succeeding child in the family. Drawing language from the literature on the economics of unemployment, the causal effect is referred to here as state dependence (or scarring). The paper investigates the extent of state dependence in India, distinguishing this from family level risk factors that are common to siblings. It offers some methodological innovations on previous research. Estimates are obtained for each of three Indian states, which exhibit dramatic differences in socio-economic and demographic variables. The results suggest a significant degree of state dependence in each of the three regions. Eliminating scarring, it is estimated, would reduce the incidence of infant mortality (among children who are born after the first child) by 9.8% in the state of Uttar Pradesh, 6.0% in West Bengal and 5.9% in Kerala. [source]

Menstrual cycle variability and the perimenopause

AMERICAN JOURNAL OF HUMAN BIOLOGY, Issue 4 2001
Kathleen A. O'Connor
Menopause, the final cessation of menstrual cycling, occurs when the pool of ovarian follicles is depleted. The one to five years just prior to the menopause are usually marked by increasing variability in menstrual cycle length, frequency of ovulation, and levels of reproductive hormones. Little is known about the mechanisms that account for these characteristics of ovarian cycles as the menopause approaches. Some evidence suggests that the dwindling pool of follicles itself is responsible for cycle characteristics during the perimenopausal transition. Another hypothesis is that the increased variability reflects "slippage" of the hypothalamus, which loses the ability to regulate menstrual cycles at older reproductive ages. This paper examines the underlying cause of the increasing variability in menstrual cycle length prior to the menopause. A model of ovarian cycles is developed, based on the process of follicular growth and depletion. Under this model, the follicular phase of each menstrual cycle is preceded by an inactive phase, a period of time when no ovarian follicles have left the resting state and begun secreting steroids in response to gonadotropin stimulation. The model makes predictions about the variability in menstrual cycles across the reproductive life span based on the size of the surviving pool of ovarian follicles. We show that the model can explain several characteristics of the perimenopause in humans and macaques and illustrate how the model can be applied to research on the biological and cultural correlates of the timing of menopause. J. Hum. Biol. 13:465,478, 2001. © 2001 Wiley-Liss, Inc. [source]

Illusion of confirmation from exposure to another's hypothesis

JOURNAL OF BEHAVIORAL DECISION MAKING, Issue 1 2006
Derek J. Koehler
Abstract We examine the influence of exposure to an advisor's hypothesis, in the form of a point estimate of an uncertain quantity, on subsequent point estimates and confidence judgments made by advisees. In three experiments, a group of unexposed advisees produced their own estimates before being presented with that of the advisor, while a group of exposed advisees were presented with the advisor's estimate before making their own. Not surprisingly, exposed advisees deliberately incorporated the information conveyed by the advisor's estimate in producing their own estimates. But the exposure manipulation also had a contaminating influence that shifted what the advisees viewed as their own, independent estimates toward those of the advisor. Seemingly unaware of this influence, exposed advisees were subject to an illusion of confirmation in which they expressed greater confidence in the accuracy of the advisor's estimate than did unexposed advisees. Copyright © 2006 John Wiley & Sons, Ltd. [source]